Sper Scientific 300056 Digital Refractometer Custom 1 Scale - Manual (Page 4)

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6. Display
7. Active Scale Indicator
8. SCALES button
9. READ button
10. ZERO button
9
10
6
7
8
▼
1 2 3 4 custom
scale
Keypad for Single Scale Models
ZERO
READ 10 9
Custom Scale
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5. ZERO CHECKING
Use this function to check the nD value of the
zero setting for distilled water.
• Fill the PRISM (3) with a standard solution
of distilled water (0.0) that is the same tem-
perature as the solution to be tested.
• Close the PRISM COVER (2).
•
Press the READ (4) button to turn the
refractometer on and obtain a temperature
reading.
•
Quickly press the ZERO (5) button once.
•
The nD value of the solution is displayed.
•
This information can be viewed at any time
to show the last calibration value.
6. BATTERY REPLACEMENT
When the low-battery symbol is displayed,
push the tab to open the BATTERY
COMPARTMENT (5) and replace the 1.5V
AAA battery with a fresh alkaline battery.