接下来我将介绍pH计的使用。首先我先介绍一下pH计，pH计操作面板上的

Next, I will introduce the use of pH meters. First, let me introduce the pH meter. The buttons on the pH meter operation panel include: pH/mV mode switching button, temperature, slope, positioning adjustment button and confirmation button, and a composite electrode. Preparation: Next, start using the pH meter, take out the electrode protective cover, connect the pH composite electrode to the pH meter, connect the power cord of the pH meter, and preheat the pH meter for more than five minutes. Press the pH/mV button to switch to pH mode. At this time, pH is displayed in the upper right corner of the instrument screen. Press the temperature button, and then press OK. Press the up and down keys to adjust the temperature to the laboratory environment temperature and confirm. Take out an appropriate amount of pH meter calibration solution in a beaker, rinse the electrode with distilled water, and dry the electrode with filter paper. Rinse the electrode with a calibration solution of pH 6.86, suck up the liquid on the electrode, open the rubber plug on the back of the electrode, place the electrode in the calibration solution of pH 6.86 for positioning, gently shake the beaker, press the positioning button and then press To confirm, press the up and down keys to adjust the pH to 6.86, and finally press the confirm button to complete the positioning. Rinse the electrode with distilled water and dry it with absorbent paper, rinse the electrode with pH 4.00 calibration solution, absorb the liquid on the electrode, place the electrode in the pH 4.00 calibration solution, adjust the slope, shake it gently, and press the up and down keys to adjust pH to 4.00, finally confirm button. After calibration, it can be used to measure the pH value of acidic solution. To determine the pH value of the solution, first rinse the electrode with distilled water, wipe it dry with filter paper, and then clean it with the test solution once, soak up the liquid on the electrode, stir the solution with a glass rod to make the solution uniform, and immerse the electrode in the test solution. Shake the beaker gently, read it after the number is stable, read the pH value, measure three times in parallel, and record the data. After the test, clean the electrode, dry it with filter paper, put on the composite electrode protective cover, put a small amount of replenisher (electrode protective liquid) in the cover, turn off the power, unplug the electrode cord, unplug the power cord, set up the instrument, and tidy the desktop . The introduction to the use of the pH meter is complete, thank you for listening.

Next I'll cover the use of pH meters. First of all, I would like to introduce the pH meter, pH meter operator panel buttons are: pH/mV mode toggle button, temperature, slope, positioning adjustment button and confirmation button, and a composite electrode. Preparation: Next, start using the pH meter, remove the electrode protection case, pH composite electrode connected to the pH meter, connect the pH meter power cord, the pH meter preheat more than five minutes. Press the pH/mV button, switch to pH mode, at this time the upper right corner of the instrument screen shows pH, press the temperature button, then press the confirmation, press the upper and lower keys to adjust the temperature to the laboratory ambient temperature, confirm. Remove the appropriate amount of pH meter calibration fluid in the beech, rinse the electrode with distilled water, and dry the electrode with filter paper. Rinse the electrode with pH 6.86 calibration fluid, absorb the liquid on the electrode, open the rubber plug at the rear of the electrode, place the electrode in the pH 6.86 calibration fluid, position it, gently shake the beo cup, press the positioning button and press the confirmation, press the upper and lower keys to adjust the pH to 6.86, and finally press the confirmation button to position it. Rinse the electrode with distilled water and dry it with absorbent paper, rinse the electrode with pH 4.00 calibration fluid, absorb the liquid on the electrode, place the electrode in the pH 4.00 calibration fluid, adjust the slope, shake gently, press the upper and lower keys to adjust pH to 4.00, and finally confirm the button. The calibration is complete and can be used to measure the pH of the acidic solution. To determine the pH of the solution, first rinse the electrode with distilled water, dry it with filter paper, clean it once with the measured liquid, absorb the liquid on the electrode, stir the solution with a glass rod, make the solution even, dip the electrode into the solution under test, shake the beo cup lightly, read it after the number stabilizes, read its pH, measure it three times in parallel, record the data. After testing, clean the electrode, vacuum dry with filter paper, set up a composite electrode protection case, the set should put a small amount of rehydration liquid (electrode protection fluid), turn off the power supply, unplug the electrode wire, unplug the power cord, set up the instrument, clean up the table. The introduction to the use of the pH meter is complete, thank you for listening.

Next, I will introduce the use of pH meters. First of all, I will introduce the pH meter. The buttons on the pH meter operation panel include: pH / MV mode switch button, temperature, slope, positioning adjustment button and confirmation button, as well as a composite electrode. Preparation: next, start to use the pH meter, take out the electrode protective sleeve, connect the pH composite electrode to the pH meter, connect the pH meter power line, and preheat the pH meter for more than five minutes. Press the pH / MV button to switch to pH mode. At this time, pH is displayed in the upper right corner of the instrument screen. Press the temperature button, and then press confirm. Press the up and down keys to adjust the temperature to the ambient temperature of the laboratory. Confirm. Take out an appropriate amount of pH meter calibration solution in the beaker, wash the electrode with distilled water, and dry the electrode with filter paper. Rinse the electrode with the calibration solution of pH 6.86, absorb the liquid on the electrode, open the rubber plug at the back of the electrode, place the electrode in the pH 6.86 calibration solution, position it, gently shake the beaker, press the positioning button, then press the confirmation button, press the up and down keys to adjust the pH to 6.86, and finally press the confirm button to complete the positioning. Wash the electrode with distilled water and wipe it dry with absorbent paper, rinse the electrode with pH 4.00 calibration solution, absorb the liquid on the electrode, place the electrode in the calibration solution with pH 4.00, adjust the slope, gently shake, press the up and down keys to adjust the pH to 4.00, and finally confirm the button. After calibration, it can be used to measure the pH value of acid solution. To determine the pH value of the solution, first wash the electrode with distilled water, dry it with filter paper, and then clean it once again. Absorb the liquid on the electrode, stir the solution with a glass rod to make the solution uniform, immerse the electrode into the solution to be measured, shake the beaker gently, read out the pH value after the number is stable, measure it three times in parallel, and record the data. After the test, clean the electrode, dry it with filter paper, put on the composite electrode protective sleeve, put a small amount of supplementary solution (electrode protection liquid) in the sleeve, turn off the power supply, pull out the electrode wire, pull out the power line, set up the instrument and clean up the table top. The introduction of pH meter is finished. Thank you for listening.<br>