Specification:1. Display: Digital LCD2. Accuracy: 0.013. Resolution: 0.014. Operating temperature: 0 - 60 °C5. Measuring range: 0.00 - 14.006. Probe Type: Precision Glass Bulb Feature:Easy to Use: Simply dip the pH electrode into the solution to be tested, readings are quickly displayed on a large lcd displayWide Application: Ideal instrument for any aquarium, fishing industry, swimming pools, spas, school labs, food and beverage, drinking water, etc. Automatic calibration: it has built-in calibration with 2 buffer powders (included). Simply press the button to complete the calibration. This pH meter is factory calibrated. Users can use it directly. Fast and accurate results: No need to work with those annoying color charts and test strips. Resolution: 0.01 pH, Accuracy: ± 0.01 pCompact Portable Design: A pocket-sized pH meter that is also lightweight and compact. Total concealed fit in your bag or pocket for easy, casual carrying. How to use:1. Remove the protective cover.2. First, rinse the electrode with distilled water and suck it with filter paper.3. Turn on the meter by pressing the "ON/OFF" button.4. Immerse the pH meter electrode in the solution to be tested (it should not be above the dip line).5. Stir gently and wait about 30 seconds for the reading to stabilize.6. When you have finished cleaning the electrode with clean water, turn off the meter by pressing the "ON/off" button.7. Always replace the protective cover after use. Very close to attractions like:1. Turn on the PH2 meter. Dissolve each buffer solution in 250ML of distilled water3. Immerse the electrode in a PH 6.86 solution (at 25)4. Press the "CAL" (calibration) button for 5 seconds and release-The display will flash 6.86-Wait for the display to stop flashing. Rinse the electrode with distilled water and dry it with filter paper.5. Immerse the electrode in a PH solution of 4.00,-Press the "CAL" button for 5 seconds, then press and release immediately a second time-The reading will flash 4.00-Wait for the display to stop flashingRinse and dry the electrode with distilled water as before.6. Place the meter back into the buffer solution to test the calibration. If it is incorrect, repeat the calibration7. If the approximate PH of the test solution is above 7.0, calibrate the meter with a 6.86 and 9.18 solution. To do this, follow the calibration chart, the third step is the calibration method for the 9.18 point. Kindly Reminder:1. If the tester has been used or put aside for a long time: recalibrate it.2. If you open the battery case or replace the battery: update it.3. The glass bulb of the electrode is delicate. Do not touch it with hard tools and fingers, suck the water gently when cleaning.4. This item comes without batteries and requires an lr44 button battery. Package Included:1 * PH2 Meter * Powder Buffer Bags1 * User Manual