new and BNC connector, suitable for most pH meter and controller with BNC connector. Suitable for wide range of application: Aquariums, Hydroponics, Laboratory etc. Measurement range: 0.00-14.00 PH Zero-point: 7 and- 0.5PH Alkali Error: 0.2PH Theoretical Percentage Slope: 98.5 percent Internal Resistance: 250M Response Time: 1min Operating Temperature: 0-60 Celsius Terminal Blocks: BNC plug Colour:black Material:plastic Package Contents: 1 x ph-201 Electrode 1 x ph power buffer 4.01 1 x ph power buffer 6.86 Only the above package content, other products are not included. Note: Light 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.