Pen Type pH & Conductivity Meter
Model: CT-6821
User Manual
Operating Instructions:
Pull out the cap before using, Do not Screw it!
*Power ON/OFF Feature
1. Press ON/OFF key to turn the Meter On and Off.
2. The Meter will shut OFF automatically if there is no operation in 5 minutes.
*Self-Checking Feature (Executing the function automatically after the meter is power on each time)
1. Press the ON/OFF key to turn on the meter, Self- Checking program will be auto-started with full
screen display.
2. The type of the meter will be displayed: 6821, then, the meter is ready for use.
3. The default mode is pH mode after the date of the manufacture.
4. The test mode will be same as the previous use.
*pH Mode
1. Press the ON/OFF key for 3 seconds, until the “pH” display on the screen.
2. Then press CAL to confirm, and the meter is ready to test in pH mode.
* ORP Mode
1. Press the ON/OFF key for 3 seconds, until the “pH” display on the screen.
2. Press HOLD key to select “ORP” on the screen.
3. Then press CAL to confirm, and the meter is ready to test in ORP mode.
* Backlight Mode
1. Press the ON/OFF key for 3 seconds, until the “pH” display on the screen.
2. Press HOLD key to select “LED” on the screen.
3. Then press CAL to confirm the backlight mode.
4. Power off the meter to close the backlight mode.
* Hold Feature
Press HOLD to freeze the current reading, and ‘HOLD’ will be appeared on the LCD. Press HOLD again to
release the hold mode.