• --Digital PH Meter Water Quality Tester: Suitable for a wide range of application
• --It's not just for home or laboratory use. Also suitable for testing the pH balance of drinking water, swimming pools, aquariums, food items, reverse osmosis systems, spas or hydroponic
• --Water Hardness Digital Tester: provides reliable and fast measurements for purity testing of most routine aqueous solution
• --suitable for: such as drinking water, swimming pools, aquariums, RO systems, spas or hydroponics

Description:
Name: Ph Meter

Calibration steps:
PH meter calibration steps:
(1) Prepare 3 cups of calibration solution with pH: 4, 6.86, 9.18.
(2) Put the pH meter into the first cup of calibration powder solution with a pH of 6.86, and press "CAL" to calibrate it to 6.86. Finally, rinse the pH electrode area with distilled water.
(3) Put the pH meter into the calibration powder solution cup with pH 4, and press "CAL" to calibrate it to 4.08. Rinse the pH electrode area with distilled water.
(4) Put the pH meter into the calibration powder solution cup with a pH value of 9.18, and press "CAL" to calibrate it to 9.18. Finally, rinse the pH electrode area with distilled water. It will be calibrated successfully!
TDS instrument calibration steps:
(1) Prepare a glass of 500 ppm water.
(2) Press the "ON" button and insert the pen into the adjusted water.
(3) Long press "shift" for 5 seconds to release, then press "hold" key.
(4) The TDS meter will be calibrated to 500ppm.

Packing list:
1 set x Ph Meter
Note:
Different displays may cause the color of the item in the picture a little different from the real thing. 
Manual measuring,please allow 1~3mm error,thank you.