Voltcraft ir 550 12d infrared thermometer voltcraft ir 550 12d the voltcraft ir 550 12d infrared thermometer allows contactless measurement of surface temperatures it measures the temperature by means of the infrared energy emitted by each object due to the contactless measurement the product is ideal for dangerous objects objects that are difficult to access moving objects or objects supplied with electrical voltage the temperature measurement range is between 50 to 550 deg c and it