- This moisture tester is an all-purpose type equipped to test all types of paper. Switching paper types for testing can be done at the press of just one button. By pressing the sensor against the paper, the moisture content can be digitally displayed in a matter of seconds. In addition, the sensor is built with a special spring construction, so you can measure with the piece of mind that the unit will not stick to the paper. This unit is hand-held, so if you're the type who is on the move in a factory, etc., this unit would be extremely convenient.