Starting at $3,402.00
  • Usually ships in 20 weeks



  • Superior accuracy (up to 0.125%)
  • Network enabled
  • Stores up to 400,000 data points
  • Wireless option
  • Accepts two interchangeable sensors
  • NIST-traceable
  • Up to sixteen different display setups
  • Advanced functions


The Fluke Calibration 1620A DewK Thermo-Hygrometer (formerly Hart Scientific) revolutionizes environmental monitoring for calibration laboratories. Two types of sensors are available from Fluke Calibration, and the DewK may be originally purchased with either one. The high-accuracy sensor ("H" model) reads temperature to ± 0.125 °C over a calibrated range of 16 °C to 24 °C. Relative humidity readings are to ± 1.5 %RH from 20 %RH to 70 %RH.

The standard-accuracy sensor ("S" model) reads temperature to ± 0.25 °C over its calibrated range of 15 °C to 35 °C. Relative humidity readings are to ± 2 %RH from 20 % RH to 70 %RH.

All DewK sensors come with NVLAP accredited certificates of calibration for both temperature and humidity, complete with data and NIST traceability. Fluke provides exceptional uncertainties, including total test uncertainty ratios better than 3:1 for both temperature and relative humidity—even for the high-accuracy sensors!