Hi Brian
I do not want to carry out major repairs on these Tonometers, we have the pressure arm and a prism so are able to do the instrument checks and would like to be able to carry out adjustments when required.
The problem that we frequently see is that the zero point has moved (so instead of -0.05 and +0.05 you have 0 and +0.1). Quite often this is due to the arm being bent, when it is not I presume the counter weight requires adjustment however with no information/instructions we can do not carry out these adjustments.
Lee
