Robust and waterproof for field application Digital pH measurement with IDS pH electrodes QSC-function for monitoring the current electrode condition The pH 3310 IDS is a handy portable pH meter for use with IDS pH electrodes. IDS pH electrodes store their calibration data and valuable sensor information. It is easy to operate with its well laid out menu guidance. With a wide choice of IDS pH and ORP sensors almost any application in the field and in the laboratory can be covered including depth measurement down to 100 m water depth.