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1, the normal switch to tap "ON / OFF" button can be. 2, automatic shutdown. If the boot after 5 minutes without any key operation, the instrument will automatically shut down; Instrument self-test function (by default every time the instrument is switched to perform this step): 1, the tap "ON / OFF" key to boot, the instrument immediately enters a self-test mode (full-display LCD); 2, then the LCD display will show the current meter Model: 6821; 3. Finally, the instrument into the normal pH or ORP measuring mode. 4, instrument factory settings, the default is "pH" mode 5, the instrument has a memory function, re-boot the instrument will work in the last measurement mode (Eg: last ORP value is detected, and then turn the LCD display or ORP measurement mode) pH measurement mode: (In the boot state) 1, press "ON / OFF" button for about 3 seconds, until the LCD display pH characters; 2, and then, and then click the "CAL" button to confirm, pH function successfully set; 3, when the instrument has entered the pH measurement mode, normal pH measurement; ORP measurement mode :( in the boot state) 1, press "ON / OFF" button for about 3 seconds, until the LCD display pH characters; 2, and then click the "HOLD" key to select until the ORP character; 3, and then, and then click the "CAL" button to confirm, ORP function successfully set; 4. The instrument has entered ORP measurement mode, normal ORP measurement backlight function: orp meter,household plants, hydroponics equipment, fish food and water plants, ph display, plants and ph, soil ph