UT333 Portable LCD Digital Thermometer Hygrometer Air Temperature Humidity Meters Description: This digital thermometer hygrometer is perfect to measure air temperature and humidity. Designed with small size and light weight for portability and easy operation. LCD screen displays the measured value in max./min., accurate and easy to read. Widely used for food storage, medical treatment, public health, laboratory, teaching experiment, plastic greenhouse and more. Features: With backlight, manually turn on or off. -10~60℃ / 14~140℉ environmental temperature measurement range, support ℃ / ℉ shift; 0~99%RH humidity measurement range, with overload indicator. Support for data hold. Low energy chip and auto power off function make this meter energy-saving. Powered by 3pcs AAA batteries, with low battery indicator. Specifications: Condition: Mode Number: UT333 Material: Plastic Color: Red + Black Power Supply: 3 x AAA Batteries (not included) Size(L x W): approx. 14 x 5cm / 5.51 x 1.97inch Weight: approx. 129g Function Range Resolution Accuracy Note Humidity Measurement 0~100.0%RH 0.1%RH ±5%RH Under Normal  Temperature Temperature Measurement -10~60℃ 0.1℃ ±1.0℃ Under Normal Humidity 14~140℉ 0.2℉ ±2.0℉ Sample Rate      1 second Once per second Overload Indicator     100%RH/OL MAX. Humidity Display: 10%RH; display "OL" if temperature is below -20℃ or more than 60℃ Max./Min. Measurement     MAX./MIN. Display "MAX/MIN" Data Hold     HOLD Display "HOLD" Unit Shift     ℃/℉ Display "℃/℉" Backlight     BL Manually turn on/off Auto Power off     5 minutes Auto power off if there is no operation lasting 5 minutes; can be set as non auto power off Low Battery Indicator     3.0~3.5V Display symbol of low battery  Package Included: 1 x Digital Thermometer Hygrometer(Battery not included) Optimum Environmental Temperature / Humidity Reference Value: 45~75%RH, 15~25℃: optimum environenment for human body 40~70%RH: habitable room 40~60%RH: libraby, art gallery, museum 45~60%RH: computer room, communication room 40~60%RH: agricultural material, textile storage 50~60%RH: dairy products storage 60~70%RH: fruit storage 30~50%RH: optimum disease prevention or healing environment Note: 1. Please allow 0-2cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.