HUMIDITY/BAROMETER/TEMP. METERMODEL: PHB-318* Barometer: 10 to 1100 hPa, mmHg, inHg* Humidity: 105 to 95% RH, Dew* Temperature: 0 to 50°C, °C/°F* All in one, pen type, easy carryout* Hold, Record (max., min)* DC 1.5V battery (UM-4, AAA) x4