Use PH meter: he from the host, the composite electrodes, there are four knobs on the host, they are: selection, temperature, slope and positioning knob. Installed equipment, electrodes, open the power switch on the rear of the instrument, a half-hour warm-up. Prior to measurement, the first PH meter calibration, we used two position calibration method, the specific steps are as follows: Select knob to adjust the PH gear; measured with a thermometer to measure the temperature of the solution, ph meter readings, such as 25oC. Knob to adjust the temperature measurements 25oC. Knob to adjust the slope of the maximum. Open electrode casing Huai'an ph meter, washed with distilled water electrode head with absorbent paper carefully dry the electrode head, the composite electrode into the standard mix of phosphate buffer solution, and the solution of the head electrode submerged glass balls, light light shaking, until the reading is stable, adjust the positioning knob so that the display is a standard PH value of the solution at 25oC 6.86. Remove the electrode, wash, dry and put it into a standard potassium hydrogen phthalate buffer solution, shake, until the reading is stable, adjust the slope of the knob, the display is a standard PH value of the solution at 25oC 4.00. Remove the electrode, wash, dry, put again the standard mixed phosphate buffer solution, shake, until the reading is stable, adjust the positioning knob, standard PH value displayed is 25oC 6.86. Remove the electrode, wash, dry and put it into a buffer solution of potassium hydrogen phthalate, shake, until the reading is stable, then adjust the slope of the knob Nanjing ph meter, PH value, so that the standard display is 25oC 4.00. Remove the electrode, wash, dry. Repeat calibration until the measured value and the standard values ??of the two standard solution PH basic line so far. After the calibration process, enter the measurement mode. The composite electrode into the beaker containing the test solution, and gently shake until the reading is stable, record the reading. After the completion of the test, remove the solution, rinsed with distilled water electrode, dry, put the casing, turn off the power, ending the experiment. PH meter use 1. Open the back cover, insert the battery one. 2. Replace the composite glass electrode: 3. Turn on the power switch, the call to the PH measurement files. 4. Measure the temperature with a thermometer PH6.86 standard solution, and then the PH meter knob to lower the temperature compensation of the measured temperature value. 5. The composite electrode with deionized water rinse, and dry with filter paper. 6. PH6.86 standard solution was poured into 2 ~ 5ml of water for wash and dry plastic beaker, and the beaker was washed after the composite electrode drained, and then added 20mlPH6.86 standard solution in a plastic beaker, the composite electrode inserted into in solution, with the instrument positioning knob to adjust the reading 6.86 until stable. 7. Wash the composite electrode with deionized water, dry with filter paper, measuring the temperature of the solution, Jiangsu PH4.00 ph meter thermometer and temperature compensation knob to the next instrument measured temperature value. 8. PH4.00 standard solution 2 ~ 5ml into another plastic beaker, after washing the beaker and the composite electrode drained, then add 20mlPH4.00 standard solution, the composite electrode into the solution, the reading is stable, with the slope of the knob adjusted PH4.00. After adjustment knob should be noted that the slope, and never move again. 9. Determination of the test solution temperature with a thermometer, and the instrument is adjusted to the temperature measured temperature compensation. 10. The composite electrode inserted into the test solution, read the PH, PH value is the test solution. 11. Note: The instrument must be calibrated before use, that is more than 4 to 8 operation. If the instrument is turned off, can be continuously measured, once the shutdown is necessary to calibrate. But 12 hours, if not shut it must be calibrated once. Suzhou ph meter, Baicheng Technology (certified), Yibin ph hundred dollars offered by Changzhou Technology Limited. Changzhou one hundred Technology Limited (www.czbckj.com) Jiangsu Changzhou, chemical instrumentation leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In one hundred as a technological leader with the staff warmly welcome all inquiries negotiations to create one hundred to a better future technology.