Product Description The TMD90A is a dual input thermometer that offers a wide temperature range and accepts type K, J, T, R, S, and E thermocouples and is ideal for HVAC/R technicians, electricians, research, industrial process, and quality control. The dual inputs allow easy super-heat and sub-cool temperature measurement as well as cut-out and in temperature measurements. The triple display with backlight shows T1, T2, and T1 – T2 and includes hold, min/max, relative, and timer/date stamp functions. The TMD90A supports dual channel real time data acquisition using the built-in RS-232 interface and optional software and data transfer cable (Model TM-SWA). High accuracy, multiple type input thermometer Displays T1, T2, and T1-T2 simultaneously Accepts six different thermocouple types Outputs real time measurement data with time stamp Measures from -328°F / -200°C to 3200°F / 1760°C Deluxe carrying case and two Type K probes RS232 output with optional cable and software, TM-SW SPECS Range Best Accuracy Type K -328 °F → 2498 °F (-200 °C → 1370 °C) 0.1 % rdg + 1.4 °F (0.1 % rdg + 0.7 °C) Type J -328 °F → 1400 °F (-200 °C → 760 °C) 0.1 % rdg + 1.4 °F (0.1 % rdg + 0.7 °C) Type T -328 °F → 730 °F (-200 °C → 390 °C) 0.1 % rdg + 1.4 °F (0.1 % rdg + 0.7 °C) Type R S 32 °F → 3200 °F (0 °C → 1760 °C) 0.1 % rdg + 1.4 °F (0.3 % rdg + 0.7 °C) Type E -328 °F → 1832 °F (-200 °C → 736 °C) 0.1 % rdg + 1.4 °F (0.3 % rdg + 0.7 °C) Operating conditions: 0 °C to 50 °C (32 °F to 122 °F) at 0 to 85 % R.H. (non-condensing) Ambient coefficient: 0 °C to 18 °C and 28 °F to 50 °C (ambient temperatures) for each °C ambient below 18 °C or above 28 °C, add the following tolerance into the accuracy spec: 0.01 % of reading +0.03 °C (0.01 % of reading +0.06 °F)