LMm - Laser Methane Detector

This video is about LMm - Laser Methane Detector
The LMm is a handheld laser detector for fast and safe detection of methane leaks at a distance of up to 30 meters.

[@narendranathghosh407]

Sir, I have this model of gas detector but not in working condition. It shows for gas test. After that the instrument become hung.