Sper Scientific 300036 Lab Digital Refractometer - Clinical - Manual (Page 5)

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3-E. Scale Selection: Press the SCALE button to toggle
though the scales. The ▼ symbol indicates the active scale.
3-F. High/Low Range Limit Alert
: A red light will flash
when the measurement is outside of the range limit.
 Setting the High Range Limit Alert
 With the unit on, press the FUNC button as needed until
H.L Y and the flashing H-Limit icon is displayed.
 Press the READ button and the last digit flashes.
 Use the ▼ and the ◄ buttons to set the high range limit.
 Press the READ button activate the function.
 Press the FUNC button as needed to return to the
measurement screen.
 Deactivating the High Range Limit Alert
 Press the FUNC button as needed until H.L n appears.
 Press the Read button to deactivate the function.
 Press the FUNC button as needed to return to the
measurement screen.
 Setting the Low Range Limit Alert
 With the unit on, press the FUNC button as needed until
L.L Y and the flashing L-Limit icon is displayed.
 Press the READ button and the last digit flashes.
 Use the ▼ and the ◄ buttons to set the low range limit.
 Press the READ button activate the function.
 Press the FUNC button as needed to return to the
measurement screen.
 Deactivating the Low Range Limit Alert
 Press the FUNC button as needed until L.L n appears.
 Press the Read button to deactivate the function.
 Press the FUNC button as needed to return to the
measurement screen.
3-G. Zero Checking:
Perform Zero Checking if the unit has
sustained a shock, is subjected to temperature changes, or
seems inaccurate.
 Fill the prism window with a standard solution. This should
be the same temperature as the solution to be tested.
 With the unit on, press the ZERO button. A refractive index
between 1.3329~1.3331 indicates that the unit is accurate.
 If the unit is out of range, a flashing crosshair symbol
will be displayed, indicating that recalibration is required.
 Press any button to exit this function.