nullBNC Electrode Probe Connector Hydroponic for PH Aquarium Controller Meter SensorThe electrode is made of PH glass electrode and a reference electrode combined composite electrode which is PH meter measuring sensor for measuring the concentration of an aqueous solution of H PH value it is widely used in various fields to be detected in the PH Electrode you are buying is a precision test sensors elaborate analysis after thorough testing as the user carefully follow these instructions before operation and maintenance of products manufactured will be able to obtain the best test results and extend the life of the electrode Maintenance and precautions 1 Test before removing the electrode protective sleeve kit solution is 3MKCL if there are crystals oozing is normal and does not affect the use of electrodes 2 Observe whether all sensitive bulb filled with liquid inside if there is a bubble you should gently shake the electrode downward like rejection thermometer to remove air bubbles inside the sensitive bulb otherwise it will affect test accuracy Specification 1 Measuring range 0 14pH2 Temperature 0 60 ℃3 The percentage theoretical slope PTS ≥98 5 25 ℃ 4 Zero pH value 7 ± 0 25pH5 Resistance ≤250MΩ 25 ℃ 6 alkali error ≤15mV 25 ℃ 7 Response time ≤2s 25 ℃ 8 Size Φ12 120 mm working environment1 Ambient temperature 5 40 degrees2 Relative humidity ≤85 Package includes 1 x BNC Connector Electrode PH Probe Sensor