The PTM1 is a high performance, precision hand-held instrument for measureing temperature using the Type J,K or T (copper-constant) thermocouples. This versatile instrument measures temperature in both ∞C and ∞F. The internal memory of the micro-computer stores minimum and maximum measured temperature for instant recall via the LCD display. Accurate to within +/- 0.7C with Resolution to within 0.1C. The PTM1 uses a standard 9V battery.