Data Logging Temperature-Humidity Monitor


Data Logging Temperature-Humidity Monitor

The #LTH8809DL temperature-humidity monitor/data logger is ideal for HVAC/R applications. Its big, bright red LED display can be seen from a distance.


Best For:



  • Large two-line red LED display shows relative humidity (RH) above temperature
  • Also calculates and displays dew point temperature
  • Designed to be wall- or desk-mounted and AC-powered, with battery backup
  • Adjustable Hi and Lo temperature and humidity alarms
  • °F/°C switch
  • Includes data logging software and USB cable
  • Large data log capacity
  • 33% and 75% #HR33 and HR75 reference salts are available to calibrate RH measurement in the field
  • NIST calibration is available
  • Specifications


    • Temperature measurement range/resolution: -4° to 158°F (-20° to 70°C)/0.1°
    • Temperature measurement accuracy: ±1.2°F (±0.6°C)
    • RH measurement range/resolution: 5 to 95%/0.1%RH
    • RH measurement accuracy: ±3% from 10 to 90%RH; ±5% elsewhere in range
    • Data logging capacity: 16,000 pairs of temperature and humidity readings
    • Display size: 2 x 2.6 in. (50.9 x 65.5mm)
    • Weight: 7.4 oz. (210g)
    • Power source: #Z110VADPT 110V AC adaptor (included), with four "AA" backup batteries (included)


    • PC data logging/interface software on CD
    • USB cable
    • #Z110VADPT 110V AC adaptor
    • Backup batteries
    • 1-year limited warranty


    • 4.8 x 5.2 x 1.6 in. (120 x 130 x 42mm)


    Which models of temperature/humidity meters have data logging capability?

    The following models of temperature/humidity meters have data logging capability: HT08, HT20, DL8835, LTH8809DL, LRTH185DL, LRTH185DL1, DTH3007SD, DLAF930SD, HWA2005DL, DAF4207SD, HWA4214SD, RHMG700DL

    My instrument is calibrateable. Do I need any additional accessories to perform the calibration?

    Some instruments do require a 33% and 75% salt bottle to perform the calibration. The following models use the HR33 and HR75 bottles: DTH3007SD, EP8703, EP8706, EP8709, EP8710, LRTH185DL, LRTH185DL1, ...
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    Prop 65

    ⚠ WARNING: This product can expose you to chemicals including di2-ethylhexylphthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to