Apera Instruments PC60-E probe is the replacement probe for Apera PC60 Pocket pH/conductivity tester. Its multi-parameter sensor allows you to measure pH, conductivity, TDS, salinity and temperature at the same time in a quick and accurate manner. This probe features Apera's unique Brush-resistant Platinum Black (BPB) sensor, which ensures accurate conductivity measurement in a wide range (0 to 20.00 mS). Its pH sensor has a glass bulb membrane and maintenance-free gel KCl electrolyte. Works great for general water solutions testing such as hydroponics, aquaculture, water/waste water treatment, pools and spas, environmental monitoring, etc.