Digital Psychrometer External Probe Temperature measurements for differential Calculates T1-T2 differential (Air Temperature minus External Probe Temperature) Features: * Simultaneous display of %RH, Temperature and Dew point or Wet Bulb or Probe Temperature * Wet bulb measurements without slinging * Calculates T1-T2 differential (Air Temperature minus External Probe Temperature) using optional probe (TP890) and T2-Dew Point * 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 * Max/Min readings * Auto power off to save battery life * RH300 complete with 2 AAA batteries * Optional external temperature probe (TP890) * Optional kit RH305 includes RH300, temperature probe, 33% and 75% calibration bottles, and carrying case RH300-CAL Optional calibration salt bottles RH305 Digital Psychrometer Kit includes RH300, 33% and 75% calibration bottles, temperature probe, and carrying case. Specifications: Humidity Temperature (internal) Temperature (external) Dew Point Wet Bulb Dimensions Weight Unique sensor cap design Twist to open or close sensor for storage. Range Max Resolution 10 to 90%RH 0.1%RH -4 to 122F (-20 to 50C) 0.1 -4 to 158F (-20 to 70C) 0.1 -90.4 to 122F (-68.0 to 49.9C) -6.9 to 122F (-21.6 to 49.9C) 7 x 1.9 x 1" (178.5 x 48.4 x 24.7mm) 3.3oz (95g) Basic Accuracy 3%RH 1F or 0.6C 1F or 0.6C Ordering Information: RH300 ..........................Digital Psychrometer RH300-NIST ................RH300 with NIST Certificate RH305 ..........................Digital Psychrometer Kit RH305-NIST ................RH305 with NIST Certificate RH300-CAL ..................33% and 75% RH calibration reference TP890 ..........................Optional Thermistor Temperature Probe (for Model RH300) www.extech.com Specifications subject to change without notice. 7/1/08 - R1 Copyright (c) 2007-2008 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form.