Extech RH300 Hygro-Thermometer PsychrometerExtech RH300 Digital Psychrometer Digital Psychrometer External Probe Temperature measurements for differential Calculates T1 T2 differential (Air Temperature minus External Probe Temperature) Key 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
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