Gas can be a silent killer if not detected in a closed environment. This 12V DC unit
simply connects to the caravan, motorhome or boat house battery and will detect any
abnormal gas levels with a voice and siren warning. See the video below how this
works. Recommended also for trade persons who carry gas equipment in closed vans
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NASA BM1 12V Battery Monitor.
NASA Monitors are back in stock. These new units are the compact type and are surface
mountable so no need to cut holes. Shows state of charge, current draw and voltage.
The best unit available in my opinion.