UNI-T UT303A UT303C UT303D Handheld Non-Contact IR Infrared Laser Industrial Digital Thermometer Temperature Tester Pyrometer High Accuracy  UT303 series infrared thermometers can precisely target objects within 250ms with single spot laser for fast troubleshooting. They feature 30:1 D:S ratio, adjustable emissivity, powered by batter y or USB. UT303 can also be used for continuous monitoring through SCAN mode.        Feature:    1. Adjustable emissivity; data hold     2. LCD backlight     3. USB interface     4. & 8451;/& 8457; options; auto power off     5. Optional (on/off) laser pointer     6. MAX/MIN/AVG/DIF display     7. Equipped with tripod installation hole      8. Lock measurement function for continuous measurement            Specifications     Range           Model     UT303A      UT303C     UT303D           Temperature Range      -32°C& 65374;650°C     -32°C& 65374;1050°C     -32°C& 65374;1250°C           -26°F& 65374;1202°F     -26°F& 65374;1922°F     -26°F& 65374;2282°F           Accuracy     ±1.8°C or ±1.8%      ±1.8°C or ±1.8%      ±1.8°C or ±1.8%            Repeatability     ±0.5°C or ±0.5%     ±0.5°C or ±0.5%     ±0.5°C or ±0.5%           Resolution     0.1°C/0.1°F     0.1°C/0.1°F     0.1°C/0.1°F           Distance to Spot Size     30:01:00     30:01:00     30:01:00           Response Time     250ms (95% of reading)     250ms (95% of reading)     250ms (95% of reading)           Emissivity     0.10& 65374;1.0 Adjustable     0.10& 65374;1.0 Adjustable     0.10& 65374;1.