1.       Pls immerse the electrode in the 10-5mol Na+ solution with pH10. Keep the instrument, beaker in the dustfree situation, or the accuracy will be affected.

2.       If the instrument do not use for a long time, disconnect the power, take off the electrode, and cover the cap on. And then connect the instrument electrode connector with the short circuit connector.

3.       Maitenance regularly.

     Weekly

1.       Check the electrode filling solution, pls refill if needed.

2.       Do the one-point calibration.

Monthly

1.       Do the two-point calibration or two-point addictional calibration.