Eti comparator eti 814 132 p the infrared thermometer comparator from eti provides an inexpensive way of checking infrared hand held thermometers when used in conjunction with a reference thermometer the comparator consists of an aluminium cup measuring oslash 60 x 100mm with a solid matt black base the base incorporates two oslash 3 5mm holes one for a reference thermometer s probe and the other for an additional probe if required p p the comparator can be used at any ambient tempe