100% BNC connector, suitable for most pH meters and controllers with BNC connector. Suitable for a wide range of applications including aquariums, hydroponics, and laboratories. Measurement range: 0.00–14.00 pH. Zero point: 7 ± 0.5 pH. Alkali error: 0.2 pH. Theoretical percentage slope: 98.5%. Internal resistance: 250M. Response time: 1 minute. Operating temperature: 0–60°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: Lighting and display differences may cause slight variation in color between the image and the actual item. Measurement error allowance: ±1–3 cm.