I just acquired a used Reichert R2 Mini Digitial Refractometer, that I need to test for accuracy. I acquired it for a low price, that the vendor agreed to refund if the unit is inaccurate or cannot be calibrated to be accurate. As I am a home enthusiast, I am prepared to take this this risk; I cannot currently afford to invest in a VST or other new unit.
Now Reichert sells a test oil, with a declared R value and temperature co-efficient, for accuracy testing. And it has excellent instructions on its website. However, they sell it for some $250 US. Any alternative suggestions for accuracy testing solutions? Any other ideas?
Even if this tests well, will the R2 Mini be sufficiently accurate, as a tool to improve my espresso extractions?
Fyi, the Reichert R2 mini technology apparently formed the basis of the original VST unit.
Any ideas or accuracy testing solution sources are welcome. I presume that all I need is the R value, as the temperature co-effecient can be determined through testing (as per the Reichert guide). Fyi, I saw a sugar based solution marketed for honey refraction testing, at a reasonable price and stated R value. Not sure if that would work.
Thanks for your help.