Basetech bt 235pt moisture meter basetech bt 235pt p the basetech bt 235pt is a moisture monitor that has been designed to measure the moisture of pot plant soil the bt 235pt will help to maintain an optimum watering balance for a range of different plant species p p the moisture meter is simply inserted into the plant compost and displays the moisture index on a scale of 1 to 7 the bt 235pt is supplied with a comparison table that specifies the ideal moisture range for many indoor plan