Abstract: A grain moisture testing apparatus which can be used for testing of moisture content of other organic materials includes means to hold and crush the material against conductance measuring electrodes. These electrodes form one element of a voltage divider, the other element of which is formed by a resistor which is selectively adjustable among several distinct values. The resistance between the two electrodes, and thus the moisture content of the material proportional thereto, is determined by applying a constant voltage across the divider and sensing the voltage occuring across the electrodes. The voltage sensor is designed as a threshold switch which gives a simple Pass/Fail indication of acceptable moisture level. The apparatus also includes voltage supply testing means and circuit temperature testing and compensation means to assure the validity of the test.