Leici PT-11 pen PH meter, also known as pH Tester, is a pen type PH meter with small size, accuracy of ±0.2pH value, and good waterproof and dustproof properties.The different nibs of the PT-11 pen PH meter are suitable for different applications, there are two kinds of conventional pen nibs and flat pen nibs, and the measurement range is 0~14.pH.PT-11 pen PH meter has the function of automatic shutdown which can extend the service life of the battery, and the durability is very good, which is suitable for measuring the PH value of daily water, food, human body, clothing, daily chemical products, etc.
1、The PT-11 pen PH meter has a professional waterproof and dustproof rating, and the durability is very good.
2. It has the functions of automatic reading, automatic shutdown and prolonging battery life.
3. There are flat plates, conventional (spherical), and tapered pen heads, which can be measured anytime and anywhere.
4. The measurement is convenient and direct, simple and easy to use.
The structure of PT-11 pen PH meter includes: protective cap, measuring end, instrument housing, display window, switch button, and battery box.
1、The PT-11 pen PH meter is powered by 4 AG5 1.5V button batteries, which are already installed in the pH Tester.
2. Press the on/off button 1 time,The PH meter is turned on and enters the measurement state;The pen PH meter chirps once to prompt the power on, and the model number is displayed: "PT-11" enters the measurement state.
3. If there is no button operation for 45s continuously, the PT-11 pen PH meter will be automatically turned off.
Press the switch for more than 3 seconds, and the pen PH meter will prompt the word "OFF" and turn it off. After that, the measuring end is cleaned with pure water, gently spun dry and stored with an electrode protective cap.
1. Take an appropriate amount of the measured sample and clean the measuring end, and gently spin off the residual sample on the measuring end after cleaning. (Sampling is to prevent cross-contamination of the tested sample)
2. Gently immerse the measuring end in the measured solution, the depth of the measured solution needs to be immersed in the measuring end, shake it gently, and press the switch button once.
3、PT-11 Pen PH Meter chirps once, and displays the word "on", indicating the start of measurement, the pen PH meter will automatically measure, automatically judge, and flash the measured PH value.
4. After the reading is stable, the PT-11 pen PH meter will automatically lock the measured value, stop flashing, and tweet 3 times to prompt the user to read.
5. If the measurement is repeated, press the on/off button again to repeat the measurement.

| Substances are often detected | PH value detection method |
| aqueous solution | Sampling for direct detection, recommendedConventional (spherical)probe |
| Household flavorings | Sampling for direct detection, recommendedConventional (spherical)probe |
| dairy product | Sampling for direct detection, recommendedConventional (spherical)probe |
| Skincare | Sampling for direct detection, recommendedflatprobe |
| textiles | Detection after partial wetting,Recommended useflatprobe |
| skin | Direct detection, recommendedflatprobe |
| Fruits/vegetables | 1. After sampling and grinding, directly or with a certain amount of water for testing, it is recommended to use a spherical probe; 2. For direct measurement, it is recommended to use a tapered pen tip |
| Meat | 1. For surface measurement, it is recommended to use a flat probe; 2. For internal measurement, it is recommended to use a tapered pen tip |
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