This unit consists of optics system, photoelectric sensor, signal amplifier, signal process circuit and LCD. 

The optics system collects the infrared energy emitted by object and focus onto the sensor. Then the 

sensor translates the energy into electricity signal which will be turned out to be readings shown on the

LCD by the signal amplifier and signal process circuit. Equipped with RS232 data export function, this
product is surely to be a great help to your work.