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== Product Overview ==
== Product Overview ==


The '''LIGO AIR''' is a Bluetooth Low Energy (BLE) wireless fuel level sensor developed and manufactured by SOJI Electronics JSC. It is designed to measure the level of liquid fuel and other non-conductive liquids in vehicle tanks and stationary fuel storage, serving fleet telematics, industrial monitoring, and off-highway machinery applications. Built on Bluetooth 5.4 with a heavy-duty metal housing and an IP69K seal, the sensor delivers seamless, real-time data transmission without complex wiring — minimizing installation effort and the risk of signal-wire tampering.
LIGO-AIR Fuel Level Sensor is developed and manufactured by SOJI Electronics JSC. The device is designed to measure the level of liquid fuel and other non-conductive liquids in vehicle tanks and stationary fuel storage, applicable in different fields. Equipped with advanced Bluetooth Low Energy technology, LIGO AIR enables seamless, real-time data transmission without the need for complex wiring and easy for installation.


The LIGO AIR series was engineered to address the long-standing weaknesses of competitive wireless fuel sensors: short battery life, unstable connectivity, and limited durability in harsh environments. With ultra-low power consumption, optional extended-life battery, and a directional-antenna long-range variant, LIGO AIR maintains stability, durability, and operational lifespan equal to — or greater than — wired sensors.  
The purpose of creating a new product was to satisfy the increasing demand of the transport telematics market for improved reliability of the design, data, and ease of installation. Unlike its predecessors, the wireless fuel level sensor helps minimize the risk of signal wire tampering.
 
In addition, the heavy-duty metal structure helps increase protection against environmental factors such as dust, moisture, vibration and high temperature conditions. This ensures that the LIGO AIR sensor maintains stability, durability, and operational lifespan equal to or even greater than that of wired sensors.
 
[[File:LIGO-AIR-product-photo.png|center|700px|thumb|LIGO AIR series Fuel Level Sensor]]


== Key Features ==
== Key Features ==


* '''High measurement accuracy''' up to '''99.5 %'''.
* High accuracy up to 99,5%.
* '''Extended communication range''' — directional antenna technology delivers up to '''1.5×''' the range of typical market-available wireless sensors.
* By utilizing directional antenna technology, the sensor achieves a communication range up to 1.5 times greater than typical market-available sensors.
* '''Ultra-low power consumption''' — '''9 µA''' in working mode, '''4 µA''' in storage mode — for longer battery life and reduced maintenance.
* With ultra-low power consumption (9uA in working mode and 4uA in storage mode), the sensor ensures longer battery life and reduced maintenance.
* '''Configurable probe length''' — can be cut or extended up to '''6000 mm'''.
* Can be optionally cut off or prolonged up to 6000mm.
* '''Wide operating temperature range''' — '''−40 °C to +85 °C'''.
* Wide operating temperature ranges from -40°C to +85°C.
* '''High TX power''' up to '''19.5 dBm''' on the LIGO AIR PRO variant.
* TX power up to 19.5dBm (LIGO AIR PRO).
* '''Extended battery capacity''' up to '''3600 mAh''' (optional).
* Battery capacity up to 3600mAh (optional) helps to extend battery life of sensor.
* '''Replaceable battery''' — supports field servicing.
* Replaceable battery.
* '''Built-in accelerometer''' (LIGO AIR PRO).
* Built-in accelerometer.
* '''Built-in 32 Mb EEPROM''' — data logs stored continuously for a minimum of 90 days, plus up to 500 setting logs.
* Built-in 32Mb EEPROM for data logs (Continuously stored for a minimum of 90 days) and setting logs (Maximum 500 logs).
* '''Built-in anti-mud oil filter and anti-vibration springs'''.
* Built-in Anti-mud oil filter and anti-vibration springs.
* '''IP69K waterproof rating'''.
* IP69K waterproof standard.
* '''8 – 10 years of battery life''' (variant-dependent).
* 8-10 years of battery life.


== Applications ==
== Applications ==


* '''Transportation / Fleet''' — trucks, excavators, cement mixers, heavy construction machinery.
* Trucks, excavators, heavy construction machines…
* '''Marine''' — marine vessels, bunker fuel monitoring.
* Marine vessels and electric generators.
* '''Power generation''' — backup and standby electric generators.
* Off-highway machinery including high-temperature & vibration environments.
* '''Off-highway machinery''' — equipment operating in high-temperature and high-vibration environments.
* Industrial oil storage tanks or stationary storage tanks.
* '''Industrial storage''' — oil storage tanks, stationary fuel storage facilities.
* '''Telecom / Infrastructure''' — base-station generators and remote-site fuel monitoring.


== Product Variants / Ordering Information ==
== Product Variants / Ordering Information ==


Three specialized versions are available, each optimized for a specific operational priority — cost efficiency, extended battery life, or long-range communication:
During our discussions with customers and market research, we found that most wireless fuel level sensors on the market suffer from key issues such as poor durability, short battery life (2-4 years), and unstable connectivity (Bluetooth signal).
 
To address these challenges, the LIGO AIR series was developed — a new generation of wireless fuel level sensors engineered for superior reliability, long battery life, and stable long-range communication in all environments.


{| class="wikitable"
The LIGO AIR series offers three specialized versions, each optimized to meet specific operational demands — from cost efficiency to long-range communication and extended battery life as bellow:
 
* '''LIGO AIR LxS:''' The standard version of the LIGO AIR sensor is designed as a cost-effective solution that fulfills essential monitoring needs while maintaining reliable performance (Trucks, excavators, cement mixer truck, heavy construction machines…)
* '''LIGO AIR LxT:''' The extended-battery version of the LIGO AIR sensor is designed for applications that demand long operational life (8-12 years) and reliable performance in harsh environments, including high-temperature conditions.
* '''LIGO AIR PRO:''' The long-range version of the LIGO AIR sensor is designed for applications requiring extended transmission distances or operation in environments with significant obstacles (Marine vessels, electric generators, Industrial oil storage tanks, stationary storage tanks…)
 
The following table summarizes the performance differences between LIGO AIR models and competitive products in terms of battery life and transmission distance:
 
{| class="wikitable" style="text-align:center;"
|-
|-
! Model !! Description !! Target Use Case
! rowspan="2" | Comparison product
! Competitive products on the market
! Standard version
! Extended battery life
! Extended transmission range
|-
|-
| '''LIGO AIR LxS''' || Standard version — cost-effective solution for essential monitoring with reliable performance. || Trucks, excavators, cement mixer trucks, heavy construction machinery.
! Product
! LIGO AIR LxS
! LIGO AIR LxT
! LIGO AIR Pro LxS
|-
|-
| '''LIGO AIR LxT''' || Extended-battery version — engineered for long operational life (8–12 years) and reliable performance in harsh and high-temperature environments. || Long-life deployments where servicing is difficult; high-temperature operation.
| style="text-align:left;" | Battery life || 0.4 x Standard (2-4 years) || Standard (6-8 years) || 1.5x Standard (8-12 years) || Standard (6-8 years)
|-
|-
| '''LIGO AIR PRO LxS''' || Long-range version — high TX power (19.5 dBm) for extended transmission distance and metal-obstructed environments. || Marine vessels, electric generators, industrial / stationary storage tanks.
| style="text-align:left;" | Transmission range || 0.6 x Standard || Standard || Standard || 2x standard
|}
|}


=== Package Contents ===
== Technical Specifications ==


{| class="wikitable"
{| class="wikitable" style="text-align:center;"
|-
! Parameter !! LIGO AIR (LxS, LxT) !! LIGO AIR-PRO
|-
| style="text-align:left;" | Standard length (L), mm || colspan="2" | 700, 1000, 1500...up to 6000 mm
|-
| style="text-align:left;" | Measuring error, % || colspan="2" | ± 0.5 %
|-
| style="text-align:left;" | Bluetooth specs || colspan="2" | Bluetooth 5.4, IEEE 802.15.4-2006, 2.4 GHz, -95 dBm sensitivity
|-
| style="text-align:left;" | TX power max || 6 dBm || 19.5 dBm
|-
| style="text-align:left;" | Advertising Protocol || colspan="2" | - SOJI Protocol (default)<br>- Mielta Protocol (setting in mobile app)<br>- Escort Protocol (setting in mobile app)
|-
| style="text-align:left;" | Power supply || 3.6V * 2600mAh (LxS)<br>3.6V * 2400mAh (LxT) || 3.6V * 3600mAh
|-
| style="text-align:left;" | Current consumption in working mode (uA) || 9 || 27
|-
| style="text-align:left;" | Measurement interval (second) || colspan="2" | From 5 to 10
|-
|-
! No. !! Item !! Quantity
| style="text-align:left;" | Advertising message interval (second) || From 5 to 10 || From 10 to 15
|-
|-
| 1 || LIGO AIR Fuel Level Sensor (standard lengths 700 / 1000 / 1500 mm; custom on request) || style="text-align:center; vertical-align:middle;" | 01
| style="text-align:left;" | Waterproof standard (Ingress protection rating, IP) || colspan="2" | IP69K
|-
|-
| 2 || Oil filter || style="text-align:center; vertical-align:middle;" | 01
| style="text-align:left;" | Operating temperature (°C) || colspan="2" | -40...+85
|-
|-
| 3 || Gasoline-resistant rubber gasket || style="text-align:center; vertical-align:middle;" | 01
| style="text-align:left;" | Resolution (bit) || colspan="2" | 12
|-
|-
| 4 || Bottom-stop and springs || style="text-align:center; vertical-align:middle;" | 01
| style="text-align:left;" | Accelerometer || N/A || Built-in
|-
|-
| 5 || Self-drilling screw M4.8 × 32 mm || style="text-align:center; vertical-align:middle;" | 04
| style="text-align:left;" | Memory || colspan="2" | Built-in 32Mb EEPROM
|-
|-
| 6 || Rivet and screw M5 × 20 mm || style="text-align:center; vertical-align:middle;" | 04
| style="text-align:left;" | Average sampling period, s || colspan="2" | 5 to 60
|-
|-
| 7 || Plastic seal cover || style="text-align:center; vertical-align:middle;" | 01
| style="text-align:left;" | Absolute error in temperature measurement within the entire temperature measuring range, °С || colspan="2" | ±2
|-
|-
| 8 || Quick installation manual || style="text-align:center; vertical-align:middle;" | 01
| style="text-align:left;" | Average service life, years (expected) || colspan="2" | 10 years
|}
|}


== Technical Specifications ==
=== Dimensions ===
 
[[File:LIGO-AIR-fig1-dimensions.png|center|700px|thumb|Figure 1. LIGO AIR series' overall dimensions (mm).]]


{| class="wikitable"
{| class="wikitable" style="text-align:center;"
|-
|-
! Parameter
! Manufacturer part number !! L (mm)
! LIGO AIR (LxS, LxT)
|-
! LIGO AIR-PRO
| style="text-align:left;" | LIGO AIR – L7S<br>LIGO AIR – L7T<br>LIGO AIR PRO – L7S || 700 ± 3
! Unit
|-
| style="text-align:left;" | LIGO AIR – L10S<br>LIGO AIR – L10T<br>LIGO AIR PRO – L10S || 1000 ± 3
|-
| style="text-align:left;" | LIGO AIR – L15S<br>LIGO AIR – L15T<br>LIGO AIR PRO – L15S || 1500 ± 3
|}
 
=== Installation Notes ===
 
This chapter outlines important considerations during the installation of the LIGO AIR sensors. For detailed installation instructions, please refer to the User Guide.
 
==== Sensor Mounting Location and Direction ====
 
* Install the sensor in the direction of maximum signal transmission (the directional arrow on the sensor cover should point toward the receiving device).
 
[[File:LIGO-AIR-fig2-mounting-direction.png|center|700px|thumb|Sensor mounting direction]]
 
* Ensure a minimum clearance of 200 mm between the top of the sensor and any overhead metal surface
 
[[File:LIGO-AIR-fig3-clearance.png|center|700px|thumb|Minimum 200 mm clearance between sensor top and overhead metal surface]]


|-
==== Sensor Seal Cover Removal Instructions ====
| Standard length (L)
 
| colspan="2" style="text-align:center; vertical-align:middle;" | 700, 1000, 1500 ... up to 6000
In cases when sensor inspection is required, the protective cap must be removed. Follow the removal procedure as shown in the picture bellow:
| mm
 
[[File:LIGO-AIR-fig4-seal-cover-removal.png|center|700px|thumb|Seal cover removal procedure]]
 
==== Solutions for Long-Range or in Metal-Obstructed Environments ====
 
In some cases, when the distance between the sensor and the receiver is long or there are many metal obstacles causing signal attenuation, customers can choose the LIGO AIR PRO to increase transmission power or install the LIGO AIR Adapter at the receiver side to boost the signal received from the sensor.


|-
Below is a comparison table of transmission distances between different types of sensors and receivers:
| Measuring error
| colspan="2" style="text-align:center; vertical-align:middle;" | ± 0.5
| %


{| class="wikitable" style="text-align:center;"
|-
|-
| Bluetooth specs
! Device !! Bluetooth signal range
| style="text-align:center;" | Bluetooth 5.4, IEEE 802.15.4-2006, 2.4 GHz, -95 dBm sensitivity<br>TX power max: 6 dBm
| style="text-align:center;" | Bluetooth 5.4, IEEE 802.15.4-2006, 2.4 GHz, -95 dBm sensitivity<br>TX power max: 19.5 dBm
|
 
|-
|-
| Advertising Protocol
| style="text-align:left;" | LIGO AIR + Telematics (tracker) device || Standard distance
|
* SOJI Protocol (default)
* Mielta Protocol (setting in mobile app)
* Escort Protocol (setting in mobile app)
|  
* SOJI Protocol (default)
* Mielta Protocol (setting in mobile app)
* Escort Protocol (setting in mobile app)
|
 
|-
|-
| Power supply
| style="text-align:left;" | LIGO AIR + LIGO AIR Adapter || 2 x Standard distance
| style="text-align:center; vertical-align:middle;" | 3.6V × 2600mAh (LxS)<br>3.6V × 2400mAh (LxT)
| style="text-align:center; vertical-align:middle;" | 3.6V × 3600mAh
|
 
|-
|-
| Current consumption in working mode
| style="text-align:left;" | LIGO AIR Pro + LIGO AIR Adapter || 4 x Standard distance
| style="text-align:center;" | 9
|}
| style="text-align:center;" | 27
| µA


|-
=== Products and Accessories ===
| Measurement interval
| colspan="2" style="text-align:center; vertical-align:middle;" | From 5 to 10
| s


{| class="wikitable" style="text-align:center;"
|-
|-
| Advertising message interval
! No. !! Description !! Qty (pcs)
| style="text-align:center;" | From 5 to 10
| style="text-align:center;" | From 10 to 15
| s
 
|-
|-
| Waterproof standard (Ingress protection rating)
| 1 || style="text-align:left;" | LIGO AIR Fuel Level Sensor. Standard lengths: 700, 1000, and 1500mm (for other customized lengths, please contact the manufacturer) || 01
| colspan="2" style="text-align:center; vertical-align:middle;" | IP69K
|
 
|-
|-
| Operating temperature
| 2 || style="text-align:left;" | Oil filter || 01
| colspan="2" style="text-align:center; vertical-align:middle;" | -40...+85
| °C
 
|-
|-
| Resolution
| 3 || style="text-align:left;" | Gasoline-resistant rubber gasket || 01
| colspan="2" style="text-align:center; vertical-align:middle;" | 12
| bit
 
|-
|-
| Accelerometer
| 4 || style="text-align:left;" | Bottom-stop and springs || 01
| style="text-align:center;" | N/A
| style="text-align:center;" | Built-in
|
 
|-
|-
| Memory
| 5 || style="text-align:left;" | Self-drilling screw M4.8x32mm || 04
| colspan="2" style="text-align:center; vertical-align:middle;" | Built-in 32MB EEPROM
|
 
|-
|-
| Average sampling period
| 6 || style="text-align:left;" | Rivet and screw M5x20mm || 04
| colspan="2" style="text-align:center; vertical-align:middle;" | 5 to 60
| s
 
|-
|-
| Absolute error in temperature measurement within the entire temperature measuring range
| 7 || style="text-align:left;" | Plastic seal cover || 01
| colspan="2" style="text-align:center; vertical-align:middle;" | ±2
| °C
 
|-
|-
| Average service life (expected)
| 8 || style="text-align:left;" | Quick installation manual || 01
| colspan="2" style="text-align:center; vertical-align:middle;" | 10
| years
|}
|}


== Compliance and Certifications ==
== Compliance and Certifications ==


=== Warranty ===


''Detailed test reports and certificate numbers: see [[Product Certification & Approvals]].''
* The warranty period is 3 years from the date of shipment by the manufacturer.
* The warranty period and service life do not apply to the battery.
* Compliance with the specified operating, transport, and storage conditions is a prerequisite for the manufacturer's guarantee.
* The manufacturer reserves the right to modify the design and composition of the product without prior notice to the customer.


=== Warranty ===
* '''Warranty period:''' '''3 years''' from the date of shipment by the manufacturer.
* The warranty period and service life '''do not apply to the battery'''.
* Compliance with the specified operating, transport, and storage conditions is a prerequisite for the manufacturer's guarantee.
* The manufacturer reserves the right to modify the design and composition of the product without prior notice.
* See [[Warranty Terms and Conditions]] for full terms, exclusions, and void conditions.
</div>


<div class="noprint">
<div class="noprint">

Revision as of 02:53, 11 June 2026

Product Overview

LIGO-AIR Fuel Level Sensor is developed and manufactured by SOJI Electronics JSC. The device is designed to measure the level of liquid fuel and other non-conductive liquids in vehicle tanks and stationary fuel storage, applicable in different fields. Equipped with advanced Bluetooth Low Energy technology, LIGO AIR enables seamless, real-time data transmission without the need for complex wiring and easy for installation.

The purpose of creating a new product was to satisfy the increasing demand of the transport telematics market for improved reliability of the design, data, and ease of installation. Unlike its predecessors, the wireless fuel level sensor helps minimize the risk of signal wire tampering.

In addition, the heavy-duty metal structure helps increase protection against environmental factors such as dust, moisture, vibration and high temperature conditions. This ensures that the LIGO AIR sensor maintains stability, durability, and operational lifespan equal to or even greater than that of wired sensors.

File:LIGO-AIR-product-photo.png
LIGO AIR series Fuel Level Sensor

Key Features

  • High accuracy up to 99,5%.
  • By utilizing directional antenna technology, the sensor achieves a communication range up to 1.5 times greater than typical market-available sensors.
  • With ultra-low power consumption (9uA in working mode and 4uA in storage mode), the sensor ensures longer battery life and reduced maintenance.
  • Can be optionally cut off or prolonged up to 6000mm.
  • Wide operating temperature ranges from -40°C to +85°C.
  • TX power up to 19.5dBm (LIGO AIR PRO).
  • Battery capacity up to 3600mAh (optional) helps to extend battery life of sensor.
  • Replaceable battery.
  • Built-in accelerometer.
  • Built-in 32Mb EEPROM for data logs (Continuously stored for a minimum of 90 days) and setting logs (Maximum 500 logs).
  • Built-in Anti-mud oil filter and anti-vibration springs.
  • IP69K waterproof standard.
  • 8-10 years of battery life.

Applications

  • Trucks, excavators, heavy construction machines…
  • Marine vessels and electric generators.
  • Off-highway machinery including high-temperature & vibration environments.
  • Industrial oil storage tanks or stationary storage tanks.

Product Variants / Ordering Information

During our discussions with customers and market research, we found that most wireless fuel level sensors on the market suffer from key issues such as poor durability, short battery life (2-4 years), and unstable connectivity (Bluetooth signal).

To address these challenges, the LIGO AIR series was developed — a new generation of wireless fuel level sensors engineered for superior reliability, long battery life, and stable long-range communication in all environments.

The LIGO AIR series offers three specialized versions, each optimized to meet specific operational demands — from cost efficiency to long-range communication and extended battery life as bellow:

  • LIGO AIR LxS: The standard version of the LIGO AIR sensor is designed as a cost-effective solution that fulfills essential monitoring needs while maintaining reliable performance (Trucks, excavators, cement mixer truck, heavy construction machines…)
  • LIGO AIR LxT: The extended-battery version of the LIGO AIR sensor is designed for applications that demand long operational life (8-12 years) and reliable performance in harsh environments, including high-temperature conditions.
  • LIGO AIR PRO: The long-range version of the LIGO AIR sensor is designed for applications requiring extended transmission distances or operation in environments with significant obstacles (Marine vessels, electric generators, Industrial oil storage tanks, stationary storage tanks…)

The following table summarizes the performance differences between LIGO AIR models and competitive products in terms of battery life and transmission distance:

Comparison product Competitive products on the market Standard version Extended battery life Extended transmission range
Product LIGO AIR LxS LIGO AIR LxT LIGO AIR Pro LxS
Battery life 0.4 x Standard (2-4 years) Standard (6-8 years) 1.5x Standard (8-12 years) Standard (6-8 years)
Transmission range 0.6 x Standard Standard Standard 2x standard

Technical Specifications

Parameter LIGO AIR (LxS, LxT) LIGO AIR-PRO
Standard length (L), mm 700, 1000, 1500...up to 6000 mm
Measuring error, % ± 0.5 %
Bluetooth specs Bluetooth 5.4, IEEE 802.15.4-2006, 2.4 GHz, -95 dBm sensitivity
TX power max 6 dBm 19.5 dBm
Advertising Protocol - SOJI Protocol (default)
- Mielta Protocol (setting in mobile app)
- Escort Protocol (setting in mobile app)
Power supply 3.6V * 2600mAh (LxS)
3.6V * 2400mAh (LxT)		 3.6V * 3600mAh
Current consumption in working mode (uA) 9 27
Measurement interval (second) From 5 to 10
Advertising message interval (second) From 5 to 10 From 10 to 15
Waterproof standard (Ingress protection rating, IP) IP69K
Operating temperature (°C) -40...+85
Resolution (bit) 12
Accelerometer N/A Built-in
Memory Built-in 32Mb EEPROM
Average sampling period, s 5 to 60
Absolute error in temperature measurement within the entire temperature measuring range, °С ±2
Average service life, years (expected) 10 years

Dimensions

Error creating thumbnail: Unable to save thumbnail to destination
Figure 1. LIGO AIR series' overall dimensions (mm).
Manufacturer part number L (mm)
LIGO AIR – L7S
LIGO AIR – L7T
LIGO AIR PRO – L7S		 700 ± 3
LIGO AIR – L10S
LIGO AIR – L10T
LIGO AIR PRO – L10S		 1000 ± 3
LIGO AIR – L15S
LIGO AIR – L15T
LIGO AIR PRO – L15S		 1500 ± 3

Installation Notes

This chapter outlines important considerations during the installation of the LIGO AIR sensors. For detailed installation instructions, please refer to the User Guide.

Sensor Mounting Location and Direction

  • Install the sensor in the direction of maximum signal transmission (the directional arrow on the sensor cover should point toward the receiving device).
Error creating thumbnail: Unable to save thumbnail to destination
Sensor mounting direction
  • Ensure a minimum clearance of 200 mm between the top of the sensor and any overhead metal surface
Error creating thumbnail: Unable to save thumbnail to destination
Minimum 200 mm clearance between sensor top and overhead metal surface

Sensor Seal Cover Removal Instructions

In cases when sensor inspection is required, the protective cap must be removed. Follow the removal procedure as shown in the picture bellow:

Error creating thumbnail: Unable to save thumbnail to destination
Seal cover removal procedure

Solutions for Long-Range or in Metal-Obstructed Environments

In some cases, when the distance between the sensor and the receiver is long or there are many metal obstacles causing signal attenuation, customers can choose the LIGO AIR PRO to increase transmission power or install the LIGO AIR Adapter at the receiver side to boost the signal received from the sensor.

Below is a comparison table of transmission distances between different types of sensors and receivers:

Device Bluetooth signal range
LIGO AIR + Telematics (tracker) device Standard distance
LIGO AIR + LIGO AIR Adapter 2 x Standard distance
LIGO AIR Pro + LIGO AIR Adapter 4 x Standard distance

Products and Accessories

No. Description Qty (pcs)
1 LIGO AIR Fuel Level Sensor. Standard lengths: 700, 1000, and 1500mm (for other customized lengths, please contact the manufacturer) 01
2 Oil filter 01
3 Gasoline-resistant rubber gasket 01
4 Bottom-stop and springs 01
5 Self-drilling screw M4.8x32mm 04
6 Rivet and screw M5x20mm 04
7 Plastic seal cover 01
8 Quick installation manual 01

Compliance and Certifications

Warranty

  • The warranty period is 3 years from the date of shipment by the manufacturer.
  • The warranty period and service life do not apply to the battery.
  • Compliance with the specified operating, transport, and storage conditions is a prerequisite for the manufacturer's guarantee.
  • The manufacturer reserves the right to modify the design and composition of the product without prior notice to the customer.


Cross-references to other documents.

Revision History

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