refractometer readings with thick jam etc

[cakedecorator1968]

I purchased a new refractometer 0-90 brix for $175.00

I can see the scale through the eye piece and HAVE been able to calibrate the unit using distilled water.

PROBBLEM:I can't see the reading when I use anything dark such as boiron fruit puree ie black currant. At times I can almost see a shadow but it's not readable.

What the heck am I doing wrong?

[Kerry Beal]

Try twisting the eye piece. That helps bring the line into focus. Aim at the brightest light you have. It's not always totally clear, but you do sort of see a range around 75 where it is pinkish below and bluer above with the dark coloured purees.