When the scale is on, press to turn off the scale.
On/off
3.2 Pre-Calibration
To calibrate the scale please follow these instructions:
First remove all objects from the platform, then press
to set the display to zero. Press the display will show
“SCALE” or “LINE”. “SCALE” means to calibrate the scale
sensitivity (normal calibration); “LINE” means to calibrate the
scale linearity. Press to confirm (If you press ,
the two kinds of calibration can be interchanged. Please
proceed to the next step below)
3.2.1 Sensitivity (regular) calibration
When calibrating the scale sensitivity, two different weight
values can be used. According to the shown calibration weight
value (ie 20.000) on the display, press , to select which
calibration weight value you want to use, then press
to confirm. The display will now show “
0
”. In a few seconds,
the display will change back to the calibration weight value (ie
20.000). Place the correct calibration weight on the center of
the platform.
In a few seconds, the display will stop, and then show the
calibration weight value again (ie 20.000). This means
calibration is complete.
3.2.2 Linear calibration
When the display is showing “LINE”, press ,the scale will
display “
0
”. In a few seconds the scale will show 1/3 (or1/2) of
!*+,!
weight value of it’s full capacity (ie 10.000); put the corresponding
weight on the center of the platform.
In a few seconds, the full capacity
weight value will be shown(ie 30.000). place
the corresponding
weight(30g) on the center of the platform.
In a few seconds the display
will stop flashing and it will show the original calibration weight value
2
(ie 30.000). Calibration is complete.
NOTE: The scale linearity has been calibrated at the factory,
this type of recalibration is not necessary unless you need to
change or alter the loadcell or adjust for certain types of
environments,
damage or errors.
Tare
3.3 Changing Weighing Units
Light
With the scale powered ON, , press to change between
the following units:
Units
g
-
oz
-
ozt
-
dwt
-
gn
-
ct*
Units
Tare
Note that the Gempro 250 has two Carat modes. One
reads in 0.001g/0.005ct increments and the other
reads to 0.002g/0.01ct. This was done so that jewelers
can choose which accuracy they require for their use.
We suggest to use 0.002g/0.01ct when possible for
maximum accuracy. Programming instructions are
shown later in this manual.
Units
Tare
Note: The scale has last unit memory, so when you turn it off
and back on it will show the last unit used.
3.4 Tare
With the scale powered ON, press to set the display to
zero.
Tare
3.5 Backlight
Press twice
F1
will appear, and the light (10d) may
turn on automatically.
Light
Tare
Press to select
F2
, this means the backlight is always
on;
Units
Press to select
F3
, this means the backlight is always
off ;
Units
Press to confirm, the backlight can be set to different
states.
Tare
3
