Horiba Scientific LAQUAtwin B-771 Instruction Manual page 35

④
Measurement
① Pour some drops of sample.
② When lights up, the measurement is completed.
To lock the measured value, press the MEAS button.
⑤ After Use
Clean the sensor with water,
and then turn OFF the power.
Close the protection cover before storage.
Make sure to store the sensor without any moisture.
The following settings can be changed.
・ Measurement unit
・ Calibration points
・ Temperature/display
Two-point calibration is recommended for accurate measurement.
Prewashing the sensor with the sample may provide accurate measurement.
Refer to page 6 to page 19 for detailed instructions.