testo 206-pH3 is equipped with a BNC socket which makes it possible to connect all pH probes to the instrument. The temperature value supplied is automatically analysed if Testo pH probes are used with a built-in temperature sensor. The temperature can be adjusted manually in probes without a temperature sensor. Automatic recognition of a stable reading facilitates the measurement process. The instrument is ideal for outdoor use or use in tough industrial conditions thanks to the "TopSafe" protection case supplied.