Greisinger balecheck hay and straw humidity measuring device greisinger balecheck 200 the greisinger balecheck 200 is a professional measuring device for measuring the moisture in bales of pressed hay and straw t it allows to easily determine the suitability for storage and quality of hay and straw important especially in agriculture stock breeding and horse keeping the slim but robust measuring rod should be used for measurements for different depths if the maximal moisture is lt16