Handheld thermocouple thermometers provide accurate and reliable temperature measurement in an economic and compact design. Features include min/max/avg, hold, °F/°C or Kelvin (K) selectable units, relative time stamp on min/max/avg, electronic off set function and auto power-off to save on battery power. Meters accept both Type K or J thermocouple probes with a mini connector. Plus the nist-traceable Pre calibration means you get reliable measurements right out of the box, saving you time and money! AO-20250-03 20250-03 is a four-input thermometer with front control buttons, temperature differential, and data logging of up to 18,000 readings. USB interface lets you easily download data to a PC for analysis. What's included: Type K bead wire temperature probes (one for each input), three AAA batteries, USB cable, software, and nist-traceable calibration report with data supplied by in no cal. Perfect for the lab to production floor reliable measurements. precalibrated to nist-traceable standards relative time stamp provides a time reference for major events electronic off set function allows compensation of thermocouple probe errors