General Tools RHMG650 9-In-1 Thermo-Hygrometer with Pin/Pinless Moisture Meter Ideal for water damage restoration contractors, facility maintenance professionals and HVAC system installers/technicians This product is easy to use easy to install and highly durable Settable high and low alarms for RH, relative moisture level and absolute moisture level and field calibratable humidity measurement Measures 9 different elements related to moisture and humidity damage Stores/recalls 20 pairs of readings and has settable high and low alarms for RH, relative moisture level and absolute moisture level Backlit LCD with 3 digit primary readout and 4 digit secondary readout Field calibratable humidity measurement Features minimum/maximum, data hold and 30 minute auto power off functions