General Tools GLMM100 Soil Moisture and Light Meter The General Tools and Instruments GLMM100 Soil Moisture and Light Meter check for adequate lighting and moisture in agricultural environments The industrial tool has a dual analog display with easy to interpret readings Heavy duty probe is accurate, sturdy and good for every day use Lightweight and easy to use, this is a great tool to use in on the go in agricultural settings The tool includes a plant water and lights requirement chart and a 1 Year Limited Warranty; no batteries are required