BOQU PHS-1705 User Manual - Page 8

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and zero value, and then the instrument returns to the measurement screen.

2.1.3 Two point calibration

Step 1 Perform one point calibration as described in 2.1.2.1.

(Do not press the "OK" button after the instrument's automatic end point or

manual end point, otherwise it will return to the measurement state.)

Step 2 Rinse the electrode with deionized water.

Step 3 Place the electrode in the next calibration buffer and press the "CAL"

button to start the next calibration.

After the signal is stabilized, the instrument will automatically end according to

the preselected end point or press the "OK" button.

Step 4 Refer to 2.1.2.2

As in 2.1.3 for 3-point calibration.

Note:

It is recommended to use a temperature probe or an electrode with a built-in

temperature probe. If the MTC (manual temperature compensation) mode is used,

all buffers and sample solutions should be kept at the same set temperature.

In order to ensure accurate pH readings, calibration should be performed

periodically.

Place the electrode in the sample solution and press the "OK" button to start the

measurement, and the decimal point on the screen flashes. The automatic

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