testo 645 - Humidity/temperature measuring instrument

Order-Nr.  0560 6450

  • High-precision humidity measurement up to ± 1% RH

  • Internal reading memory (3,000 readings)

  • Convenient data evaluation via optional PC software

  • Possibility of attaching a really wide range of optional probes thanks to a large accessory portfolio

The testo 645 humidity/temperature measuring instrument automatically indicates the measurement parameters of relative humidity, absolute humidity, dew point, degree of humidity, enthalpy and temperature at the touch of a button.

This meter uses a sensor to start up.

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Product Description

The testo 645 high-precision humidity and temperature measuring instrument offers two probe inputs for attaching a comprehensive range of probes:
  • Channel 1: temperature probe, type K/J/S, NTC
  • Channel 2: humidity/temperature probe or Pt 100 temperature probe

At the touch of a button, the thermohygrometer automatically indicates the measurement parameters of temperature, relative humidity, dew point, pressure dew point, absolute humidity, degree of humidity and enthalpy, along with min., max. and mean values, as well as the last measured value. Convenient evaluation of the measurement data is possible using the optional PC software. Measurement data can also be printed out directly at the measuring location via the optional testo fast printer.

Areas of application of the testo 645 humidity/temperature measuring instrument

  • Monitoring of temperature and humidity values in production, storage and server rooms, museums, archives, cold stores, containers and display cases
  • Location of mould formation in residential or other buildings 

 

Delivery Scope

testo 645 humidity/temperature measuring instrument, including battery.
Temperature - Pt100

Measuring range

-200 to +800 °C

Accuracy

±0.1 % of mv (200.1° to 800 °C)

±0.2 °C (-200 to 200 °C)

Resolution

0.1 °C

Temperature - NTC

Measuring range

-50 to +150 °C

Resolution

0.1 °C

Temperature - TC Type K (NiCr-Ni)

Measuring range

-200 to +1370 °C

Accuracy

±0.5 % of mv (-200 to -60.1 °C)

±0.5 % of mv (+60.1 to +1370 °C)

±0.3 °C (-60 to +60 °C)

Resolution

0.1 °C

Temperature - TC Type J (Fe-CuNi)

Measuring range

-40 to +750 °C

Accuracy

±0.5 % of mv (-200 to -60.1 °C)

±0.5 % of mv (+60.1 to +750 °C)

±0.3 °C (-60 to +60 °C)

Resolution

0.1 °C

Temperature - TC Type S (Pt10Rh-Pt)

Measuring range

-50 to +1700 °C

Humidity - Capacitive

Measuring range

0 to 100 %RH

Accuracy

see probe data

Resolution

0.1 %RH (-50 to +150 °C)

General technical data

Dimensions

215 x 68 x 47 mm

Operating temperature

0 to +50 °C

Housing

ABS

Number of channels

2-channel

Battery type

9V block battery

Battery life

45 h

Battery feaute

The hour times are reduced by a factor of 5 if a 9V rech. battery is used

Display type

LCD

Display size

4 lines

Storage temperature

-20 to +70 °C

Weight

255 g

Accessories: Humidity probes

Connection cable

Order Number: 0430 0143

$91.30 incl. Tax

Humidity and temperature probes

Temperature - NTC

Measuring range

-20 to +70 °C

Accuracy

±0.4 °C (-10 to +50 °C)

±0.5 °C (Remaining Range)

Humidity - Capacitive

Measuring range

0 to +100 %RH

0 to +1

Accuracy

±1 %RH (+10 to +90 %RH)

±2 %RH (0 to +10 %RH)

±2 %RH (+90 to +100 %RH)

±0.01 (+0.1 to +0.9 )

±0.02 (+0.9 to +1 )

Pt100 temperature probes

Standard immersion/penetration probe

Order Number: 0604 0273

$295.00 incl. Tax
Temperature - Pt100

Measuring range

-200 to +400 °C

Accuracy

Class A (-100 to +400 °C)

Class B (Remaining Range)

Reaction time

20 s

$626.00 incl. Tax
Temperature - Pt100

Measuring range

-100 to +350 °C

Accuracy

±(0.06 °C + 0.1 % of mv)

Reaction time

30 s

Temperature - Pt100

Measuring range

-100.0° to 265.0 °C

Accuracy

±(0.06 °C + 0.1 % of mv)

Reaction time

80 s

Type K (NiCr-Ni) probes

$83.60 incl. Tax
Temperature - TC Type K (NiCr-Ni)

Measuring range

-60 to +130 °C

Accuracy

Class 2 ²⁾

Reaction time

5 s

2) According to standard EN 60584-2, the accuracy of Class 2 refers to -40 to +1200 °C.

Additional accessories and Spare parts