Chauvin Arnoux CA 10101 [P01710010] Waterproof Portable pH Meter. The C.A 10101is the first instrument in the new range of portable electrochemistry equipment launched by Chauvin Arnoux. Designed to measure pH, redox potential (ORP) and temperature, this pH-meter is ideal for mobile applications in the field, in the lab or in production. This accurate, versatile instrument has been designed for use in diverse sectors: agri-food, environment, waste water treatment, education, research, agriculture, pharmaceuticals, cosmetics, etc.