# Calibration

Boil 3 liters of water with 1 kg of sugar to begin with.\
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Use a hydrometer to work out and create solutions of **1.050**, **1.040**, **1.030**, **1.020**, **1.010**, and finally clean water at **1.000**.\
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Configure the iSpindel to report every 60 seconds into Brewfather. From the devices page, you can then read the current value every minute. Start by reading the angle in SG 1.000 and, if needed, adjust the weight to give a starting angle of around 25 degrees.\
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After reading and recording all angles in the different solutions, fill in the values in the calibration spreadsheet for the iSpindel project, and it will calculate the formula based on your unit.\
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Copy the formula into your Polynomial under Configuration and start reading the values in the different solutions again. **Make sure to use the formula that reports in Plato**. Brewfather then converts it into the unit you have chosen in the settings. If the gravity is displaying 1.004 in Brewfather you are using the wrong formula.

If you are using Plato in Brewfather for the SG solutions above you should see values close to 0, 2.5, 5, 7.5, 10 and 12.5 Plato matching the correct SG.

#### Resources

Excel calibration sheet: <https://github.com/universam1/iSpindel/blob/master/docs/Kalibrierung_en.xlsm>

More info: <https://github.com/universam1/iSpindel/blob/master/docs/Calibration_en.md#formula>\
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## Related docs

* [iSpindel Setup](/integrations/ispindel.md)
* [Devices](/devices.md)


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