The R40 series of fixed infrared temperature sensors is a single-piece compact pyrometer with the optics and electronics built into one housing. Made of ANSI 304 stainless steel, each R40 unit has a five-digit, backlit LCD display and four-key menu on the back of the unit for local reading and setting. Nine different R40 models are available, with thermopile and photodiode sensors having various temperature ranges from 32°F to 5432°F (0°C to 3000°C). Seven of the available models feature built-in lasers to assist with aiming. Signal processing capability is included in the R40, including peak hold, valley hold and averaging functionality.