instructions Some hydrometers come packed in a tube you may use for test samples, others you may
need a hydromater jar, which is a tall cylinder plastic or glass jar for the hydrometer to float in.
Proof and Tralle instructions a pdf
instructions A plain wine thief is like a straw (glass), insert it and put your finger over
the top to remove the sample up and out for tasting or testing. This thief is a step above.
Refractometer instructions, a pdf