RS Stock No.:
Mfr. Prt No.:
0560 4351

Technical Reference

Legislation and Compliance

RoHS Status: Not Applicable

Statement of Conformity

RS Components
Statement of Conformity

This statement confirms that the product detailed below complies with the specifications currently published in the RS media and has been subject to the strict quality conditions imposed by RS Components’ internal management systems. Furthermore and where applicable, it confirms that all relevant semiconductor devices have been handled and packed under conditions that meet the administrative and technical requirements of ANSI/ESD S20.20 and EN61340-5-1 electrostatics control standards.

Compliant Product Details
RS stock number 5120323
Product description TESTO 435-1 METER
Manufacturer / Brand Testo
Manufacturer part number 0560 4351

The foregoing information relates to product sold on, or after, the date shown below.


Date May 25, 2024

RS Components Pte Ltd Robinson Road, P.O. Box 1582, Singapore 903132

Country of Origin: DE

Product Details

Testo 435-1 Multi-Function Meter

From Testo, the 435-1 Multi-function meter designed for measuring adjusting and testing HVAC systems and assessing air quality. The professional hand-held meter provides instant, accurate readings allowing the user to easily pinpoint and troubleshoot areas of concern. Configurable with an array of different probes, the Testo 435-1 is the essential instrument for service engineers HAVC technicians and building inspectors

Ergonomically designed, the robust hand-held digital meter utilises a range of optional plug-in probes to deliver readings with a high degree of accuracy. Depending on the probe selected, the Testo 435-1 meter has the capability to measure temperature, humidity, CO2 and absolute pressure, air velocity and volumetric flow rates.

With an easy to navigate keypad and soft control buttons, operation of the Testo 435 is incredibly easy. Probe dependant menus and selectable user profiles for typical applications and measurements make complicated programming unnecessary. With minimal effort, the user can easily select the parameters and functions to be measured. With a large backlit LCD display, all collected readings are clearly shown on the front screen, even in low light conditions. A handy auto-off feature also helps to conserve battery life.

Features and Benefits

• Accepts a wide array of probes for airflow, temperature, humidity, CO2 and CO
• Robust IP54 Casing
• Accurate, reliable results
• Easy to navigate
• Easy to read LCD display
• Backlight function
• Integrated rubber boot and magnetic back
• Auto-off function
• Low battery indication


The Testo 435-1 multifunction test meter is the preferred instrument for HVAC engineers, building and energy management specialists commissioning experts. They are used to measure airflow, temperature, humidity, CO2 and CO quickly and accurately. The information and data they provide are vital in a wide range of applications and environments. They are essential for reporting, forecasting, planning and most importantly health and safety. Some of the more common applications are

• HVAC system performance
• Environmental testing
• Measuring room climate
• Air conveyors
• Air balancing
• Air inlet and outlets
• Air and surface temperature

Compatible plug-in probes for the Testo 435-1

Multi-function Probes

• IAQ (Indoor Air Quality) probe to assess Air Quality, CO2, humidity, temperature and absolute pressure. See part number 512-0755
• Thermal velocity probe with built-in temperature and humidity sensors. Telescopic handle. See part number 512-0783

Flow Probes

• Anemometer vane measurement probe with telescopic handle for duct measurements. See part number 512-0610

Air Probes

• Robust NTC air probe. See part number 512-0525

Surface Probes

• Fast action surface probe with sprung thermocouple strip. Type K. See part number 516-0618
• Pipe wrap probe for pipe diameters from 5 to 65 mm. Type K. See part number 191-6221
• Clamp pipe probe for pipe diameters from 15 to 25 mm. See part number 518-5285

Immersion / penetration probes

• Waterproof immersion/ penetration probe. Type K. See part number 512-0711


Attribute Value
Brand Testo
Measurement Parameters Humidity, Temperature
Maximum Air Velocity 40 m/s
Probe Type Hotwire, Rotary Vane
Temperature Measurement Resolution 0.1 °C
Best Temperature Measurement Accuracy ±0.2 °C
Power Source Battery
Battery Type AA
Battery Life 200 h
Height 46 mm
Width 74 mm
Length 225 mm
Minimum Operating Temperature -20 °C
Model Number p Testo 435-1
Maximum Operating Temperature +50 °C
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