UT309 series professional infrared thermometer can determine surface temperature through the energy radiated by the target surface. It is designed to meet some of the highest protection ratings in UNI-T's product line, IP65 and 3m drop-proof. With a rapid response rate of 250ms, high measurement accuracy, and multiple scanning modes, UT309 proves to be a necessary tool for engineers and technicians working in various fields such as electrical distribution inspection, HVACR maintenance, transportation equipment inspection, instrument repair, and many more. Features: 3m drop-proof, IP65 Large LED display with backlight MAX/MIN/AVG/DIF mode High/Low-temperature alarm with LED indication Lock measurement Data hold/auto power-off Specifications: Temperature: -35 ~ 450°C-31~ 842°F Temperature testing precision: ≥0°C: ±1.8°C Repeated accuracy: ±1.0°C or ±0.8% Display resolution: 0.1°C/0.1°F D:S (Distance to Spot Size): 10:10 Response time: 250ms (95% of reading) Emissivity : (adjustable, step length: 0.01) 0.95 Laser count: Single point laser Laser type: Type 2 (Ⅱ) Laser power: ＜1mW Laser wavelength: 630nm ~ 670nm Spectral response: 8μm ~ 14μm Package Include: 1 X UNI-T UT309C Professional Infrared Thermometer