American Weigh Scales SM-DR - Manual (Page 4)

2. The display will then show "0.0", Hold the ON
key again for 3 seconds until it displays "0", then
release.
3. The LCD will now display the required calibration
weight for your scale* and "g" will be flashing.
4. Place your required calibration weight on the
platform. After 5 seconds, g will stop flashing.
Calibration is complete.
(*note: when the LCD displays the required
calibration weight value, you can press TARE to
change the value to "100g" if desired.The default
calibration weight is the optimal weight to use,
however - see list above)
IV. TROUBLESHOOTING
The primary reasons for inaccuracy or malfunction
are low batteries, incorrect calibration, overload or
operating on an unstable surface. Please keep this in
mind and maintain and operate your scale properly.
This scale is a precise instrument and must be
handled with the utmost care and caution.
[Display] Elimination of errors
[Err3] You are overloading the scale. Remove the
excessive load immediately!
[ ] Readjust or replace batteries.
[88888] Use the scale in a more stable position