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Lab-Grade Instruments Designed Specifically For Growers

Lab-Grade Instruments Designed Specifically For Growers

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3.1

   Power on the pen and remove the probe cap. Always calibrate 7.00 pH first. 

4.1

   Power on and remove the probe cap.

4.2

   Rinse the probe with clean water and shake off excess water.

4.3

  Fully submerge the probe into the solution at least 1 inch deep, make a 

quick stir to remove potential air bubbles around the probe. 

4.4

   Hold the pen and wait for the reading to stabilize (       stays on screen), 

then record the reading.

4.5

   Thoroughly rinse off the probe with clean water, then close the probe cap.

3.2   

Rinse the probe with clean water and shake off excess water, then submerge 

it in the 7.00 pH standard buffer; shake the probe up and down in the 

solution for a few seconds and let it stand. 

3.3   

Hold         until screen turns green. The pen starts automatic calibration. 

Wait for "Good" to show up (in 10-15 seconds), indicating the calibration is 
completed, then the pen returns to measurement mode.

3.4 

         icon will show up on the lower left corner of the screen indicating the pen 

is successfully calibrated. Repeat Step 3.2 to 3.3 to calibrate pH 4 using 4.00 

pH buffer, then       will show up next to       . 

 

  You can continue to calibrate pH 10 by repeating Step 3.2 to 3.3 using 10.01 

pH buffer (sold separately), then       will show up to the right of      

3.5

        /      /       will disappear in 30 days after calibration, reminding you to re-

calibrate the tester. We recommend calibrating pH at least once a month to 

ensure accuracy. If you feel like the accuracy might be off, simply test the 

standard buffers (make sure the buffers are fresh and clean). If a discrepancy 

is found, then it’s time to calibrate again.

Short press any key while calibrating (in green screen) to cancel calibration and 

return to measurement.

Calibrating pH 10 is usually not necessary unless your estimated target pH is 

greater than 8.0 pH.

Short press any key while calibrating (in green screen) to cancel 

calibration and return to measurement.

Always perform at least a 2-point pH calibration to ensure accuracy. Start 

with 7.00 pH, followed by 4.00 pH immediately. If you happened to turn 

off the pen before calibrating 4.00 pH, you need to start with 7.00 pH again 

after rebooting the pen, then 4.00 pH.

7.00

pH

7.00

pH

3.6  

If the calibration fails, the screen will turn red. For details, see Section 13 

Troubleshooting Guide.

5.1

  Power on and remove the probe cap. Press       to switch to EC 

measurement mode. Rinse the probe with clean water and shake-
dry, then submerge it in the 2.77 EC standard solution; shake the 
probe in the solution up and down for a few seconds
 to remove 
potential air bubbles, then let it stand. 

5.3  

       icon will show up on the lower left corner indicating the tester is 

successfully calibrated.       will disappear in 30 days after calibration, 

reminding you to re-calibrate EC. We recommend calibrating the 

EC once every month to ensure the accuracy.  If you feel like the 

accuracy might be off, simply test the standard solution (make sure 

the standard is fresh and clean). If the reading is greater than 2.8 EC 

or smaller than 2.7 EC, then it’s time to calibrate again.

5.2  

Hold       until screen turns green. The pen starts automatic 

calibration. Wait for "Good" to show up (in 10-15 seconds), 
indicating the calibration is completed, then the pen returns to 
measurement mode.

5.4 

 If the calibration fails, the screen will turn red. For details, see 

Section 13 Troubleshooting Guide. 

2.77

EC

2.77

EC

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04

05

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pH Calibration

pH Measurement

EC Calibration

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