Dear Manager,
Are you interested in Ultrasonic Fuel Level Sensor for GPS tracker & Mobile DVR?
Our sensor has been approved by Teltonika, Meitrack, Calamp,  Queclink, iCarvision, and most other M2M devices.
And we're the 1st company that launch Ultrasonic Fuel Sensor in M2M markets since 2012.
a. Support RS232 output & Analogue Output (0~5V) 
b. Resolution: 0.1 mm,  Accuracy: ±0.5%
c. Support Diesel, Gasoline and most liquid. 
d. Support 1 ~2.5m range  

Can I know which tracker or DVR you're trying?
Would you like some samples to try?

Tenet Auto Electronics Ltd. 
Whatsapp: +8617322329061