The Altek 22 is a thermocouple simulator that is intended for calibrating T/C inputs. It can be used for thermocouple types "J", "K", "T", "E", "R", "S" or "B" with 22 precise test points. This device can exhibit ± 0.1% of span in degrees based on NBS, now NIST, and Monograph 125. In addition, it is powered by 2 AA alkaline batteries that have a long life span of 1,000 hours.