Working environment Room temperature 5-40 degrees Relative humidity of the environment: 85 percent Use, Care and Precautions 1.Remove the electrode protective cover before testing (the solution in the cover is 3MKCL, if crystals ooze out, this is a normal phenomenon and will not affect the use of the electrode) 2. Observe if the inside of the sensitive bulb is completely filled with liquid. If bubbles are found, gently shake the electrode (like a thermometer) to remove the bubbles in the sensitive bulb, otherwise it will affect the accuracy of the test. Calibration and testing of electrodes and pH meter 1.Connect the pH electrode to the PH instrument input terminal and the connection is correct. 2. Perform calibration according to the instruction manual of the instrument, and the calibration result should be measured.