I ordered a refractometer, after my hydrometer arrived broken. But it has total different scales from my one still in storage and now I am struggling to find out how to calibrate it. Scale 1: Water. 12.0 - 27.0 % Scale 2: Brix: 92-58 % Scale 3: Be°(?) 4.3 - 3.8 20 oC (I assume thats the calibration temperature). The manual only gives an ecample of calibrating with distilled water to a gravity of 1.000 (for which there is no scale) Please help!