G&G GmbH | Operating elements 10For an external calibration, you need a reference weight that has a smaller tolerance than the scalesreadout. During the calibration the scale will “learn” how “heavy” a specific weight is at the localenvironment conditions and adjust according to this. Due to this, it is important that the reference weighthas a smaller tolerance than the scale can determine the weight. We recommend to use weights that areproduced within the OIML-Tolerance classes (E2 for example). Which weight is required for which scale,can be found in the table of technical data.7.1 CalibrationThe scale must be turned on for at least the required warm up time, display is on “0”.Press and hold the “CAL” key until the display changes to "C XXX".XXX is the required weight of the reference weigh, when it displays "C 100" now a 100g weight must beplaced in the middle of the plateframe. After a view seconds, the calibration weight displayed and thestable weight symbol "g" shows that means the calibration is complete.If after pressing “CAL" key the scale shows "C----F", the zero point is unstable. Use the "TARE" key return tozero. Now press the "CAL" key again.8 Operating elements1. Weighing pan 2. Pan support ring 3. Wind protection 4. Underfloor weighing widget5. Sealing cap 6. Adjustable feet 7. RS232 Interface 8. Level Indicator9. Power socket 10. AC adapter cable 11. ON/OFF key 12. Calibration key13.Unit change key 14. Counting key 15.Print key 16.Tare key