How to use 1. Remove the cap of the pen and switch on the "ON" switch; 2. Put the pen into the test solution, the height of the test solution should not exceed the maximum immersion line; 3. Stir gently to drive away air bubbles around the electrode; leave it to wait for the measurement until the reading stops fluctuating and the result can be read; 4. Press the "MODE" button briefly to switch the function. Attention 1.Wiping the remaining water of the pen with cloth after you finish and re-cover the pen cap; 2.Do not long press any key, all the keys of the test pen are short press use (press once), long press will lead to program failure. Directions 1. Remove the cap of the pen and switch on the 'ON' switch; 2. Put the pen into the test solution, the height of the test solution should not exceed the maximum immersion line; 3.
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