[NOTICE] The package contains pH4.01 / 6.86/9.18 buffer Powder. We had strictly test each pH

pen before shipped to make sure PH meter pen can read accuratly. The first time use it you

dont need to cal it! You need to cal it again if dont use it for a long time

[Sensitive Electrode] pH tester has a sensitive electrode sensor to read accurate ph levels.

(Accuracy range: ±0.01) You can test the PH value for any 0-16 PH liquid.

[Auto Temperature Compensation] This pH measure built-in (ATC) automatic temperature

compensation, it can accurately determine the pH value of the sample in a range of 0°C - 60°C

(32°F - 140°F). So you dont worry about temperature of the sample.

[Healthy Lifestyle] pH meter can tell you the acidity and alkalinity of water ensure health of

drinking water and keep it in perfect pH balance, pH value of drinking water range of 6.5-8.5

to meet the EPA standards. You can test drinking water, swimming pools, aquariums,

hydroponics, wine and beer and so on.

Temperature automatic compensation function.

The normal range is between 6-8, with 7 being neutral.

PH tester usage related issues:

When the PH meter is turned on in the air, the value jumps irregularly, which is a normal phenomenon.

The value in the air cannot be used as a reference.

When measuring the water with the PH meter, it needs to be stirredgently

(to remove the bubbles attached to the probe), and it takes aperiod of stabilization.

It is normal for the value to jump up or down during the test. Please dont just insert it and read it immediately.

White crystalline salt appears around the electrode of the PH meter, which is a normal phenomenon of the PH electrode,

and the electrode can be removed by immersing it in water and cleaning.

The PH meter electrode is made of glass, which is fragjile. Please dont drop it or touch it with your hands.

Dont test the water above 50°C. Dont test the strong acid and alkali, which will cause the electrode glass to burst.

Its used in most fields related to water quality analysis, such as teaching, scientific research and laboratory.

Working principle of pH pen

Pen pH meter | acidity meter consists of three parts:

1. A reference electrode;
2. A glass electrode whose potential depends on the pH value of the surrounding solution;A
3. n ammeter, which can measure the small potential difference in the circuit with great resistance.

Before the first use, the glass electrode must be soaked in distilled water for more than one day and night.

At ordinary times, it should also be soaked in distilled water for ready use at any time.

The glass electrode should not be in contact with strong water absorbing solvent for too long.

It should be operated as soon as possible when used in strong alkali solution. Wash it with water immediately after use.

The bulb film of the glass electrode is very thin and cannot collide with the glass cup and hard objects;

When the glass film is stained with oil, it should be soaked with alcohol, then carbon tetrachloride or ether,

and finally soaked with alcohol, and then washed with distilled water. For example,

when measuring the pH of the solution containing protein, the surface of the electrode is polluted by protein,

resulting in unreliable and unstable readings and errors.

At this time, the electrode can be soaked in dilute HCl (0.1mol / L) for 4-6 minutes to correct.

After the electrode is cleaned, it can only be gently sucked dry with filter paper. Do not wipe it with textile,

which will cause static charge on the electrode and lead to wrong reading. When calomel electrode is used,

pay attention to fill the electrode with potassium chloride solution without bubbles to prevent open circuit.

There should be a little potassium chloride crystal to keep the solution saturated.

When in use, remove the rubber plug on the top of the electrode and flow a small amount of potassium chloride solution from the capillary to make the determination result reliable.