Extech Digital Psychrometer Datalogger with NIST Certificate RH350-NIST

Product Highlights Superheat differential measurements: T1-T2, Air-T1, T1-Dewpoint Dual Type K external temperature probe inputs (T1, T2) Simultaneous display of %RH, Temperature and Dew point or Wet Bulb or External Probe Temperatures Built-in RS-232 interface — uses optional Windows® 95/98/2000/ME/NT/XP compatible software Memory stores up to 99 data records Retrieve Max/Min readings with data and time plus Average function Real time clock Triple display with backlighting Unique sensor cap design twists to closed position for protection during storage Switchable °F/°C temperature units with 0.1° resolution Data Hold freezes current reading on display Auto power off to save battery life Optional RH355 kit includes RH350, 33%and 75% calibration bottles, PC software with cable cable, and case Each Unit Includes NIST Certificate Two Type K bead wire temperature probes 4 AAA batteries