Testo 625 Digital Thermohygrometer with App Connection | Temperature & Humidity Meter | -20 to +60 °C | 0 to 100 %RH

Product Overview

The Testo 625 Digital Thermohygrometer with App Connection is a compact and professional measuring instrument designed for accurate measurement of air temperature and relative humidity. It is ideal for applications where environmental conditions need to be monitored and documented, including indoor air quality assessment, HVAC systems, laboratories, storage areas, warehouses, clean rooms and industrial environments.

The testo 625 combines a built-in temperature and humidity sensor with a clear digital display and Bluetooth connectivity to the testo Smart App. Through the app, users can configure the instrument, view measurements, monitor graphical measurement curves, save measurement data and create documentation directly on a smartphone or tablet.

In addition to temperature and relative humidity, the instrument automatically calculates dew point temperature and wet-bulb temperature, providing additional information for professional environmental and climate monitoring.

The testo 625 also features an audible alarm that alerts the user when configured temperature or humidity limits are exceeded.

Key Features

• Measures air temperature and relative humidity

• Temperature measuring range: -20 to +60 °C

• Humidity measuring range: 0 to 100 %RH

• Temperature accuracy: ±0.5 °C

• Humidity accuracy: ±2.5 %RH from 5 to 95 %RH

• Resolution: 0.1 °C / 0.1 %RH

• Bluetooth App connectivity

• Compatible with the testo Smart App

• Calculates dew point temperature

• Calculates wet-bulb temperature

• Displays time and point averages

• Graphical measurement history through the app

• Measurement data storage through the app

• Smartphone can be used as a second display

• Audible alarm when configured limits are exceeded

• Compact handheld design

• Includes transport bag

• Powered by 3 × AA batteries

• Approx. 100-hour battery life

• Ideal for HVAC, laboratories, storage and indoor-air-quality applications

Technical Specifications

Temperature Measurement

The testo 625 uses an NTC temperature sensor to measure air temperature over a range of -20 to +60 °C.

It provides:

• ±0.5 °C accuracy

• 0.1 °C resolution

• Reliable measurement for indoor and environmental applications

This makes it suitable for monitoring temperature in offices, laboratories, warehouses, storage areas, HVAC installations and other controlled environments.

Humidity Measurement

The instrument uses a capacitive humidity sensor to measure relative humidity from 0 to 100 %RH.

The specified accuracy is ±2.5 %RH within 5 to 95 %RH, with a resolution of 0.1 %RH.

This allows users to monitor humidity conditions where moisture levels are important for comfort, storage, manufacturing and environmental control.

Dew Point & Wet-Bulb Temperature

The testo 625 automatically calculates additional environmental parameters including:

Dew Point Temperature

Dew point indicates the temperature at which moisture in the air begins to condense. It is useful for identifying potential condensation risks on surfaces, pipes, walls and equipment.

Wet-Bulb Temperature

Wet-bulb temperature is useful for assessing evaporative cooling conditions and environmental climate parameters.

These calculated values make the testo 625 more versatile than a basic temperature and humidity meter.

testo Smart App Connectivity

One of the main advantages of the testo 625 is its connection to the testo Smart App.

Using the app, users can:

• Configure the measuring instrument

• View live measurement values

• Use a smartphone as a second screen

• View graphical measurement curves

• Save measurement data

• Store measurement history

• Manage customers and measuring sites

• Document measurements on site

• Create reports

• Send measurement documentation by email

The app therefore makes the testo 625 useful not only for taking measurements but also for recording and documenting professional measurements.

Audible Alarm

The testo 625 can provide an audible warning when a configured temperature or humidity limit is exceeded.

This is particularly useful when monitoring environments where maintaining specific conditions is important, such as:

• Storage rooms

• Laboratories

• HVAC systems

• Warehouses

• Clean rooms

• Production environments

Applications

The Testo 625 can be used across a wide range of professional applications.

HVAC & Building Services

• Indoor climate measurement

• Heating and ventilation systems

• Air-conditioning systems

• Building inspections

• Comfort measurements

Laboratories

• Environmental monitoring

• Temperature and humidity checks

• Controlled laboratory environments

Warehouses & Storage

• Temperature monitoring

• Humidity monitoring

• Storage-condition verification

• Sensitive material storage

Industrial Applications

• Production-area monitoring

• Environmental quality control

• Process-area inspections

Indoor Air Quality

• Office environments

• Commercial buildings

• Schools

• Healthcare facilities

• Other occupied spaces

Cold Storage & Controlled Environments

• Storage rooms

• Refrigerated environments

• Temperature/humidity condition checks

Testo specifically positions the instrument for assessing indoor air quality and maintaining optimum storage conditions.

Compact & Portable Design

The testo 625 weighs only 199 g and measures 208 × 60 × 28 mm, making it convenient to carry from one measurement location to another.

Its compact handheld construction is suitable for technicians, engineers, laboratory personnel and quality-control professionals who need to take measurements at different locations.

Battery & Power

The testo 625 operates using 3 × AA batteries and provides approximately 100 hours of battery life under the manufacturer's specified conditions.

The battery-powered design allows the instrument to be used without an external power supply, making it suitable for field measurements and mobile inspections.

Protection Rating

The instrument has an IP20 protection class.

For applications requiring additional protection, Testo offers the TopSafe protective case (0516 0224), which provides IP65 protection when the sensor is plugged in.

Package Contents

The standard Testo 625 package includes:

• 1 × Testo 625 Digital Thermohygrometer

• 1 × Transport Bag

• 1 × Test Protocol

• 3 × AA Batteries

Why Choose Testo 625?

The Testo 625 is a professional solution for users who need more than a basic temperature and humidity meter. It combines accurate environmental measurement with Bluetooth connectivity, mobile data documentation, dew-point and wet-bulb calculations, graphical measurement history and audible alarms.

Its compact design and app-based documentation make it particularly useful for technicians and professionals who regularly need to measure, record and report environmental conditions.

Product Highlights

Brand: Testo
Model: 625
Order No.: 0563 1625
Product Type: Digital Thermohygrometer
Temperature Range: -20 to +60 °C
Humidity Range: 0 to 100 %RH
Temperature Accuracy: ±0.5 °C
Humidity Accuracy: ±2.5 %RH
Resolution: 0.1 °C / 0.1 %RH
Connectivity: Bluetooth
App: testo Smart App
Dew Point: Yes
Wet Bulb: Yes
Alarm: Audible
Protection: IP20
Power: 3 × AA batteries
Battery Life: Approx. 100 hours
Weight: 199 g
Dimensions: 208 × 60 × 28 mm
Product No.: 0563 1625