and high quality 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 -: 7 +- 0.5PH Error: 0.2PH Theoretical Percentage Slope: 98.5% Internal Resistance: 250M Response Time: 1min Operating Temperature: 0-60 Celsius Terminal Blocks: BNC plug Colour: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, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.