Extech RH520A

Humidity+Temperature Chart Recorder with Detachable Probe

Order #: RH520A-NIST

Mfg #: RH520A-NIST

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Graphical datalogger for Humidity/Temperature measurements and Dew Point calculation

  • This paperless chart recorder provides simultaneous digital and graphical display of relative humidity and temperature.
  • The display also shows dew point, date and time and Min/Max measurements. Stored readings can be recalled on the display or downloaded to a PC to obtain a permanent record.
  • Provisions for wall mounting or the control panel swivels to act as a desk stand.
  • The user can set audible and visual alarms with High and Low limits for humidity and temperature.
  • ExChart software calculates Wet Bulb and Grains per Pound (GPP).
  • Comes complete with detachable sensor probe with 1 meter cable, RS-232 cable with USB adapter, Windows-compatible software, 100-240 VAC 50/60Hz adapter, and three AA batteries.


  • Simultaneous numerical and graphical display of Humidity and Temperature readings, plus Time and Date
  • Measures Humidity (10 to 95%RH) and Temperature (-20.0°F to 140.0°F) plus calculates Dew Point
  • Basic accuracy 3%RH, 1.8°F/1°C
  • Large dual graphical LCD displays with adjustable vertical and horizontal TAC resolution
  • Internal memory records up to 49,000 data points and can be transferred to a PC via RS-232 serial port for further data analysis
  • LCD indicates percentage of memory remaining.

Each Unit Includes
Built-in stand
Detachable probe with
3ft (1m) cable
RS232 cable
RS-232 To USB Adaptor
LabView-based PC software
100-240VAC 50/60Hz adaptor
3 AA batteries


Specifications Range
Relative Humidity Range 10.0 to 95.0%
Temperature Range -20.0 to 140.0°F (-28.0 to 60.0°C)
Accuracy ±3% Relative Humidity; ±1.8°F/±1°C
Dimensions 5 x 7.7 x 0.9″ (129x195x22mm)
Weight 12.6oz (357g)