15 RF153-en-GB_V1.1 11/18
Manual Measurements
After placing the measurement liquid, press
M to start measuring. The measurement
result will display on the LCD and save to
memory automatically (see Section 5-2). If
ERR is displayed, an error has occurred,
please refer to Section 5-3-2.
Press M
→ → →
Zero Calibration
Placed distilled or tap water on the prism,
long press M to access the zero function.
Long press M
→ → →
• Perform a zero calibration before each
use.
• Temperature of distilled/tap water
should equal ambient temperature.
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