Testo 645 - Humidity/Temperature Measuring Instrument

Part Number: 0560 6450 Brand: Testo

Testo 645 - Humidity/Temperature Measuring Instrument

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The highly accurate thermal hygrometer Testo 645 has two probe inputs for the connection of an extensive range of probes:
  • Channel 1: temperature Type K/J/S, NTC
  • Channel 2: combine probe humidity/temperature or temperature probe Pt 100
The measuring instrument automatically displays the measurement parameters temperature, relative humidity, dewpoint, pressure dewpoint, absolute humidity, degree of humidity and enthalpy, and additionally presents the current values, the last measured values, min., max. and mean values at the press of a button.

Measurement data can be stored by measurement site in the Testo 645, and analyzed on a PC, or documented using the Testo fast printer (option).

The TopSafe (option) is available for tough applications. The measuring instrument, probes and accessories can be stored safely and tidily in the transport case (option)
  • Highly accurate humidity measurement up to ±1 %RH
  • Connection of 2 plug-in probes
  • Measurement of temperature, relative humidity and pressure dewpoint
  • Internal measurement store (3000 measurement values)
  • PC software for the analysis, archiving and documentation of the measurement values (option)
  • Button for Hold, min./max. values, mean value calculation
  • Convenient data analysis



Operating Temperature

  • 0° C to +50° C

Storage Temperature

  • -20° C to +70° C


  • LCD, 4 lines

Battery Type

  • 9 V Block Battery

Battery Life

  • 45 h


  • 215 x 68 x 47 mm


  • 255 g

Housing Material

  • ABS
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