This app calculates grain moisture using the dial reading determined by the 919/3.5" or 393/3.5" moisture meter, and the grain temperature. Over 50 choices of grains built into one app using linear regression formulas based on up to date tables provided by the Canadian Grain Commission (CGC). Don't risk using the possibly out of date paper tables that came with the meter. An app made by farmers, for farmers at a reasonable price.