Are the cleaning methods adequate? I do not think so.
Independent of the refractometer, which again I claim is not cleaned properly in the above video procedure, did you notice that when the stopper was removed urine dripped down the outside of the tube onto the operators gloves.
A question if I may - I made the table for the fipple much deeper than 1/32", I am about 3/32". I do get the intended C4 when blowing very softly, with a little C5 included that too quickly takes over if I blow a little harder and if I blow moderately it becomes C6.
Are the cleaning methods adequate? I do not think so.
Independent of the refractometer, which again I claim is not cleaned properly in the above video procedure, did you notice that when the stopper was removed urine dripped down the outside of the tube onto the operators gloves.