This electrode is a high accuracy composite laboratory electrode with accurate measurement and wide measuringrange This probe can be used as a replacement part of the meter to replace the damaged originalpart and prolong the service life It is sturdy and , economical and practical , fully meeting the needs of various industry tests , and suitable for various PHQ9 BNC plugs Can be used for general water applications such as drinking , domestic and rainwater , aquariums , tanks , pond , pools , spas The size of the probe sensor is 5.8in , simple and comfortable to install and use 120cm or 200cm cable are avaliable This meter BNC connector has excellent waterproof and field applicability , and can measure the value of various liquids Comes with protective carrying case and protective cap , ensures of the bulb, Manufacturer: Watreketal