Testo infrared temperature measuring instruments testo 0563 8314 the 830 t4 infrared thermometer from testo supplied in a practical set which enables you to measure surface temperatures in trade and industry quickly and precisely both on a non contact basis and with surface contactthe infrared thermometer measuring spot diameter is only 36mm at a distance of 1m to the surface thanks to the 301 optics this means even temperatures of small objects can be reliably determined from a safe dis