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testo 206-pH3 - pH measuring instrument (for flexible use)

  • External pH probe can be connected – for flexible use

  • Automatic final value recognition

  • Robust and waterproof thanks to TopSafe (IP 68)

  • Automatic temperature evaluation (if a probe with temperature sensor is connected)

Are you looking for a pH measuring instrument for flexible use (e.g. in liquid, semi-solid or even more aggressive media)? The advantage of the testo 206-pH3 pH measuring instrument is that it enables you to connect an external pH probe for adjusting the measuring instrument to your requirements.

Product Description

The advantages and features of the testo 206-pH3 pH measuring instrument

The main advantage of the testo 206-pH3 pH measuring instrument is that it has a connection for an external pH probe. You can use the BNC socket to connect a probe suited to your requirements and swap it as and when needed (probe can be ordered separately). Testo offers pH probes for liquids, a food probe (also for semi-solid media) and a pH glass electrode for use in more aggressive media.

Some pH probes from Testo have an in-built temperature sensor. When this kind of probe is used, the delivered temperature value is evaluated automatically. In the case of probes without a temperature sensor, the temperature can be adjusted manually.

Automatic final value recognition makes the measuring process easier. The TopSafe protective case provided protects the measuring instrument against dirt, water and impact (in compliance with IP 68). This means that the measuring instrument can also be used outdoors or in harsh industrial conditions.

Note: to commission the testo 206-pH3 pH measuring instrument, you will need a connectible pH probe (can also be ordered). Testo offers various probes. You can also use suitable pH probes from other manufacturers.


Delivery Scope

testo 206-pH3 pH measuring instrument with BNC interface, incl. TopSafe and belt/wall bracket.

Temperature - NTC

Measuring range

0 to 80 °C (depending on the pH probe used)


±0.4 °C


0.1 °C

pH - Electrode

Measuring range

0 to 14 pH


±0.02 pH


0.01 pH

General technical data


69 g


197 x 33 x 20 mm ((LxWxH))

110 x 33 x 20 mm (without probe and TopSafe)

Operating temperature

0 to +60 °C

Product-/housing material


Protection class


Product colour


Battery type

1 x CR2032

Battery life

80 h (Auto Off 10 min)

Display type


Display size

2 lines


BNC interface

Number of channels


Measuring rate

2 measurements per second

Temperature compensation

Automatically or manually (dependant on external probe)

Storage temperature

-20 to +70 °C