General Tools RHMG650 Precision Moisture Meter is a high performance moisture meter/thermo-hygrometer that takes 9 different measurements including pin and pinless moisture, ambient temperature and RH, absolute humidity, GPP, and others. General Tools RHMG650 stores and recalls up to 20 paired readings, has configurable alarms for RH and relative/absolute moisture levels, and has a bright backlit LCD with dual displays.