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.

Click here for filter selection.

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

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

Accessories: Humidity probes

Extension cable

Order Number: 0409 0063

MYR 506.14
excl. VAT
Connection cable

Order Number: 0430 0143

Price on Request

Caps for humidity probes

Sintered stainless steel filter

Order Number: 0554 0641

MYR 249.68
excl. VAT
Metal protection cap

Order Number: 0554 0755

Price on Request
Price on Request
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
Price on Request

Additional accessories and Spare parts

Extension cable

Order Number: 0409 0063

MYR 506.14
excl. VAT
Connection cable

Order Number: 0430 0143

Price on Request
9V rech. battery for instrument

Order Number: 0515 0025

Price on Request
Sintered stainless steel filter

Order Number: 0554 0641

MYR 249.68
excl. VAT
Price on Request

Printer and accessories

testo fast printer IRDA

Order Number: 0554 0549

Price on Request
Price on Request

Software and Accessories

RS232 cable

Order Number: 0409 0178

Price on Request

Transport and Protection