The Pocket Sized pH Meter is a waterproof pH tester with a 0.01 pH resolution and an accuracy of 0.05 pH. It has many advanced features that are found in more expensive portable instrumentation. One or two-point calibration is automatic to two selectable buffer sets (4.01, 7.01 and 10.01 or 4.01, 6.86, and 9.18).pH value and temperature are key parameters for guaranteeing the quality assurance of products in the food sector, in the cosmetics industry, in the sanitary and HVAC sector, etc. With the testo 206-pH1 starter set, you can get started straight away with measuring the temperature and pH value in liquids (e.g. in drinking or heating water).