Protos
Die Schwarzbier Polizei
For several years I've been using a Stevenson Reeves Hydrometer being totally happy with it.
Since having a second Just-In-Case-Hydrometer is a must for a homebrewer and my second Hydrometer (a German one, Balling scale) had been accidentally shattered without even much use I bought another Stevenson Reeves, triple scale (SG/Balling/Potential Alc.).
Then, comparing both in the same bucket of water I was surprised as my old Hydrometer read 0.998 while the new one 1.004. Quite a difference, I should say. Not so happy to see such a respected brand producing measuring equipment that differentiates so wildly.
Which one is correct then?
To calibrate my glass and electronic Thermometers, I use a Medical Thermometer as a reference point, making a simultaneous measuring of 40C water and marking the difference (like "+1C", "-2С", "EXACT") right on the Thermometers.
I wonder, what to use for a reference point when calibrating Hydrometers?
Since having a second Just-In-Case-Hydrometer is a must for a homebrewer and my second Hydrometer (a German one, Balling scale) had been accidentally shattered without even much use I bought another Stevenson Reeves, triple scale (SG/Balling/Potential Alc.).
Then, comparing both in the same bucket of water I was surprised as my old Hydrometer read 0.998 while the new one 1.004. Quite a difference, I should say. Not so happy to see such a respected brand producing measuring equipment that differentiates so wildly.
Which one is correct then?
To calibrate my glass and electronic Thermometers, I use a Medical Thermometer as a reference point, making a simultaneous measuring of 40C water and marking the difference (like "+1C", "-2С", "EXACT") right on the Thermometers.
I wonder, what to use for a reference point when calibrating Hydrometers?