Temperature range:-20-60C(-4-140F)Humidity range:0-100RHDew point range:-50-60C(-58-140F)Power supply: AAA 1.5V *4(Do not contain batteries) Description:MT-4616 Temperature Humidity Dew Point TesterDew point measurement: Calculate the occurrence of icy goods; the possibility of exposure, avoiding the occurrence of harmHigh-speed microprocessor chip for higher stability and reliabilityWith data retention, backlighting, data storage, low voltage indicationUnit conversion, automatic shutdown, Max value Min value measurement functionApplicable to high temperature environment testApplicable to petrochemical, Electric power, metallurgy,electronics, chemical pollution detection