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Specification• Handheld Digital Temperature and Humidity Meter • Display of indoor temperature and humidity • Changeable Temperature Unit (°C/°F) • MAX/MIN indoor temperature and humidity values are stored in memory. • Data-hold function• Temperature Range: -10°C to +50°C (+14°F to +122°F) • Humidity Range: 20% RH to 99% RH • Power-supply: 1.5V (AAA size)×1HOW TO ASSEMBLE/ USE Loosen the screws, open battery compartment cover, take out the polarity insulator and Put on the cover, then the Metes starts to work.