SNDWAY SW572 Industrial High-Precision Digital Thermometer and Hygrometer Handheld Portable Gauge Tester Air Test Instrument Function:Ambient temperature and relative humidity can be measured in real time. The relative humidity refers to the proportion of the absolute water vapor content and the content of saturated water vapor in the gas in the same gas volume at the same temperature and preure. Large display:Large LCD display, convenient button, you can view the minimum and maximum values with one push of a button. Fast measurement:Combination of two measurement functions for temperature and humidity for more comfort. The product uses a highly sensitive sensor for faster measurements with an adoption of 0.5 seconds. Alarm function:It is convenient for inspectors to quickly recognize unusual conditions. Data Storage:Stores up to 100 pieces of data, useful for viewing and organizing data. Model:SW-572 Temperature measuring range:-20.0 C ~ 60.0 C (-4 F ~ 140 F) Temperature accuracy:+/- 0.3 C ( +/- 0.5 F) Temperature. Resolution:0.1 C (0.1 F) Humidity measuring range:0% RH ~ 100% RH Humidity accuracy:+/- 3% RH Moisture resolution:0.1% RH Response time:more than 2 s (depending on heat exchange) Humidity time:8s (humidity is 63%, 25 C, 1m / s air flow) Sampling rate:0.5 seconds Temperature. Alarm max / min:Yes Humen Max / min Warning:Yes Temp. Max. / Min:Yes Humen Max. Size / min. Size:yes Storage:100 Data retention:Yes The backlight switches off automatically:10 minutes Automatic / manual shutdown:30 minutes Power supply:3 x 1.5 V AAA batteries (not included) Working environment:-20.0 C ~ 60.0 C, 0% ~ 100% RH Storage environment:-10.0 C ~ 60.0 C, relative humidity 20% ~ 70% Colour:black Material:plastic + electronic components Size:188 x 64 x 27mm Package Contents:1 x digital temperature detector 1 x Chinese and English manual Only the above package content, other products are not included. Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.