testo 645 - Humidity/temperature measuring instrument

Order-Nr.  0560 6450

This meter uses a sensor to start up. Click here for probe selection.
Price on Request
  • 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.


Details

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.

Technical Data

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

Product-/housing material

ABS

Number of channels

2-channel

Battery type

9V block battery

Battery life

45 h

Battery feature

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

Display type

LCD (Liquid Crystal Display)

Display size

4 lines

Storage temperature

-20 to +70 °C

Weight

255 g


Probes

Accessories: Humidity probes

Extension cable

Order Number: 0409 0063

SAR 440
excl. VAT
Connection cable

Order Number: 0430 0143

SAR 251
excl. VAT
SAR 646
excl. VAT

Caps for humidity probes

Sintered stainless steel filter

Order Number: 0554 0641

Price on Request
SAR 271
excl. VAT
Metal protection cap

Order Number: 0554 0755

SAR 163
excl. VAT
SAR 242
excl. VAT
Wire mesh filter

Order Number: 0554 0757

Price on Request

Humidity probes

Humidity/temperature probe

Order Number: 0636 9742

Price on Request

Pt100 temperature probes

Standard immersion/penetration probe

Order Number: 0604 0273

Price on Request
SAR 1,632
excl. VAT

Accessories

Additional accessories and Spare parts

Extension cable

Order Number: 0409 0063

SAR 440
excl. VAT
Connection cable

Order Number: 0430 0143

SAR 251
excl. VAT
Sintered stainless steel filter

Order Number: 0554 0641

Price on Request
SAR 1,366
excl. VAT
SAR 242
excl. VAT

Printer and accessories

testo fast printer IRDA

Order Number: 0554 0549

SAR 1,121
excl. VAT
SAR 123
excl. VAT

Software and Accessories

RS232 cable

Order Number: 0409 0178

SAR 347
excl. VAT

Transport and Protection


This meter uses a sensor to start up. Click here for probe selection.
Price on Request