Generic 0.1pH PH002 High Accuracy Pocket Size pH Meter with ATC(Automatic Temperature Compensation) LCD 0-14 pH Measurement Range, 0.1 Resolution Handheld pH Pen Tester

Measuring range (Range): 0.00-14.00PH
Accuracy (Accuracy): ± 0.1PH
Operating voltage: 3 * 1 .5V
Operating temperature: 0-60 degrees
Resolution (Resolution): 0.1PH
Size (Size): 150mm (L) × 27mm (W) × 15mm (H)
PH meter calibration:

1. the pH electrode at 6.86 (25 ℃ immersed in a pH, the standard mixed phosphate buffer solution, and gently shaken.
2. with a small screwdriver to adjust the calibration potentiometer until the display value and standard buffer solution at ambient temperature ph value match.
3. the electrode into phosphorus potassium pH4.00 stupid acid or borax pH9.18 standard buffer solution.
4. after about two minutes or so. The pH value of the buffer solution is displayed shall be compared to the range of allowable error.
Note:

In the following cases, PH meter must be recalibrated: After calibration has been used (or place) for a long time; Frequent use of special electrodes; Accuracy requirements are relatively high.
Steps:

1. Remove the protective cover.
2. first with distilled water pH meter electrodes. And the electrode dry with filter paper.
3. turn the switch located on the battery compartment.
4. the pH meter is inserted measured liquid, until the liquid immersed ""immersion line"", conditions permitting, the solution can be dipped slightly ""immersion line"" position.
5. Gently stir the solution and wait for about two minutes Chung. Read the display.
6. after use. Clean the electrode. Turn off the switch. Wear a protective sleeve.
Meter calibrator: i.e. pH standard solid material. Can be used to open the package after adding water. Applies to any type pH meter calibration.