The testo 206 series is ideally suited for applications in liquid and semi-solid media. The instruments stand out thanks to the combination of a pH immersion probe and a temperature probe for precise and fast temperature compensation. Thanks to the large volume of gel electrolyte and the dual wall diaphragm, the probe is leak-proof, maintenance-free and insensitive to dirt. The automatic final value recognition supports the user during measurement. The protective cover TopSafe provides the instruments with the protection class IP68, it is dishwasher-safe, hygienic and protects the measuring instrument from dirt, water and impact. The testo 206-pH1 is specially designed for fast pH checks in liquids. The testo 206-pH2 is ideally suited for pH measurement in semi-solid and protein-rich foods such as jellies, creams, cheese, fruit etc. The testo 206-pH3 is equipped with a BNC socket which allows the connection of any pH probes to the instrument, depending on the application. This makes the instrument universally applicable.