Sper Scientific 300055 Digital Refractometer Automotive - Manual (Page 4)

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6. Display
7. Active Scale Indicator
8. SCALES button
9. READ button
10. ZERO button
Keypad for Single-Scale Models
9
10
ZERO
READ 10 9
6
7
8
▼
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make sure to close the COVER on the
PRISM
during measurement.
• After about 3000 tests, turn the unit off for 5
to 10 minutes to rest the battery.
6. 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
temperature as the solution to be tested.
• Close the 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.
7. 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.