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Brandt Instruments Distributing Testo

Testo 625, humidity, temperature instrument

testo 625 Thermohygrometers
Rh & Temp with Wireless Technology


Testo 625 Thermpohygrometer with Fixed Rh Probe


The testo 625 measures relative humidity, temperature and dew point in 3 modes: fixed probe, cable probe, plus optional wireless mode. It is used in applications such as heating, ventilation and air conditioning (HVAC), water restoration, mold and moisture prevention and remediation, the clean room industry, or food manufacturing or preparation.

The humidity range is 0 to 100% RH using the testo patented humidity sensor. The temperature range is 32 to 122 °F (0 to 50 °C) using a thermistor (NTC) type sensor.

The basic 625 comes with a built-in humidity probe head. The large 2 line display shows humidity, wet bulb temperature or dewpoint as well as temperature.

When measuring hard to reach areas, the humidity probe head can be easily removed and attached to the optional handle via the probe cable.

Alternatively, the readings can be transmitted wirelessly up to 65 feet from the probe to the measuring instrument. To accomplish this, the humidity probe head is attached to the radio handle (accessory) and the radio module (accessory) is added to the testo 625 meter

   625 Advantages at a Glance

  Simultaneous display of humidity/temperature or dewpoint/temperature
  Two-line display for checking/monitoring ambient conditions
  Auto OFF, Battery display
Hold button to freeze readings
  Switchover function: °C/°F; Hold/Max/Min
  Backlit display
  Dew point calculation
  2 year guaranteed long-term stable humidity measurements
  testo humidity sensor is unaffected by water
  TopSafe case available to protect the instrument from dirt & impact

testo 625 Technical Data & Kits

testo 625 Technical Data

Humidity Probe RH 0 to 100% RH
Accuracy  1 digit RH: ± 2.5% RH (+5 to +95%RH)
Temperature: ±0.5°C/°F 
Storage Temperature  -40 to 185°F (-40 to 85°C) 
Operating Temperature -40 to 122 °F (-20 to 50°C)
Probe Type NTC Measuring Range 14 to +140°F (-10 to 60°C), Accuracy ±0.9°C/°F 
Probe Type K Measuring Range 0328 to +2500°F (-200 to +1370°C)
Probe  Attached to housing by a flexible cable
Ø 0.5, length 8 in , lead length 35 in.

(Ø 12 mm, length 200 mm, lead length c. 0.9 m)
Warranty  2 years
Display LCD, 2 lines
Dimensions: WxLxH 2.5 x 7.00 x 1.6  inches, 182 x 64 x 40 mm
Housing ABS
Weight 7.0 oz (195 g)
Battery 9 volt
Battery Life Approximately 70 hours of operation (without transmitter)


Testo 625 Thermohygrometer used in Industry

testo 625 Used in Industry

Testo 625 Thermohygrometer with fixed probe used in Offices

testo 625 Used in Offices


Part #

Kit Description

0563 6251
625 Hygrometer: meter with integral humidity probe head, battery, manual & calibration certificate
400563 6251
625 Remote Probe Kit: meter with handle/cable for plug-in RH head, case, battery, manual & calibration certificate
400563 6252
625 Wireless Kit: meter, 0554 0190 wireless module, 0554 0191 wireless handle TC/RH, battery, manual, calibration certificate & case
0554 0647
Stainless steel sintered cap, Ø 0.5” (12 mm) is screwed onto the humidity probe for measurements at high velocity or dusty environments
0430 9725
Handle/cable for plug-in 625 RH head & T/C temp. probes
0516 0210
Soft zippered case for instrument and probe
0516 0221
TopSafe (indestructible protection case)


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Brandt Instruments, Inc. 
    18568 Oak Grove Parkway 
    Prairieville, LA  70769 
Phone: 225-673-6776
    Fax: 225-673-6725

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