Sper Scientific 300037 Refractometer - Programmable - Manual (Page 5)

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 With the unit on, press the ZERO button. A
refractive index reading between 1.3329~1.3331
indicates that the unit accurately reads to the
calibrated zero point.
 If the unit is out of range, a flashing crosshair
symbol will be displayed, indicating that
recalibration is required.
 Press any other button to exit this function.
 Perform Zero Checking if the unit has sustained
a shock, is subjected to temperature changes,
or seems inaccurate.
5. PARAMETER SETTINGS
A. Changing the Temperature Scale
 With the unit on, press the FUNC button as
needed until t.P C (or F ) is displayed. Press the
SCALE
button to view the temperature in
Fahrenheit (or Celsius). Press the READ button
to exit.
B. Automatic Temperature Conversion
 This makes manual temperature correction
unnecessary, but to obtain precise readings the
sample and unit should be at similar ambient
temperatures. ATC appears on the LCD when
this function is activated. To set the ATC
function, press the FUNC button as needed until
ALC.Y (or N) appears. Press the SCALE button to
toggle between on or off. Press the READ but-
ton twice to exit.
C. Scale Selection
 Press the SCALE button to toggle though the
scales. The ▼ symbol indicates the active scale.
D. High/Low Range Limit Alert
Setting High Range Alert
 With the unit on, press the FUNC button as need-
ed until HL Y and the flashing H-Limit icon is dis-