Voltcraft 12d20d infrared thermometers voltcraft ir 800 20d the voltcraft 20d infrared thermometer is a high quality device that has been designed with a number of outstanding and innovative featuresprecision while aiming and high measurement accuracy take the centre stage through the double fixing laser and the adjustable degree of emission while spot measurements can be done very quickly through the very short response time along with the standard measurement function this device posse