BNC connector, suitable for most pH meters and controllers with BNC connector. Suitable for a wide range of applications: aquariums, hydroponics, laboratories, etc. Measurement range: 0.0014.00 pH. Zero point: 7 0.5 pH. Alkali error: 0.2 pH. Theoretical percentage slope: 98.5%. Internal resistance: 250 M. Response time: 1 minute. Operating temperature: 060 C. Terminal blocks: BNC plug. Color: black. Material: plastic. Package contents: 1 PH-201 electrode, 1 pH power buffer 4.01, 1 pH power buffer 6.86. Only the above package content is included; other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is 13 cm.