This electrode is a PH all-glass electrode that is to strong acids and alkalis. The electrode interface is BNC. The electrode is not online. This electrode is a composite of a PH glass electrode and a reference electrode. It is a measuring element of a PH meter and is used to measure the hydrogen ion concentration (PH value) in an solution. Portable pH electrode,Suitable for most pH value and controller BNC connector,When the PH electrode used for the first or long home without, activated 2 hourselectrode ball soaked in 3.3N potassium chloride solution Sino-French Measurement should be washed in distilled water and wipe dry with filter paper to prevent impurities into the electrode bulb and liquid contact Ministry should also beimmersed in the test solution within pH composite electrode, not be added to the outside of the reference solution. Product Name:Laboratory pH electrode Temperature:5-60 Celsius Zero potentiometer(pH):71 Internal resistanceM(25): less than equal 250 Theoretical percentage slopepercent : equal 97percent Terminal Blocks: BNC Plug Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Photo Color Material:Plastic + Glass Package Contents: 1 x Ph Electrode Probe Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.