Just saw a used AT550 on ebay. I wanted to ask a couple of questions. I read some past posts that suggested that the AT550 wasn't good for self-tonometry.........why is this?? Sounds like you just look at something, push a button, and it takes the measurement. Sounds fairly user-friendly. Also, if I were to buy a used instrument, how much do you think it would cost? How much are one of these new?? Thanks for your answers on this one.
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