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Alan K.
I use this one because it is a dual sensor, shows you the levels, and will send me an alarm when I am away from the bus. Super easy to install and setup.
I prefer units with their own battery – a detector running on the 12v supply of the RV can have the supply fail.. and that potentially lets off smoke or worse fire, and the alarm is dead and useless. It’s easy to replace batteries once a year. I do it the first week of January as part of the new year ritual.