Datasheet

testo 645
www.testo.com
Data sheet
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: combi 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
Humidity/temperature
measuring instrument
testo 645 – Highly precise
measurements for industry
%RH
°C