Hello and thanks for responding so quick. Your English is very good compared to my Swedish. I do not have a probe yet because I don't know what would be compatible. I would like to buy the Mitutoyo 519-521 lever probe if it works and is compatible. Also if I could find someone who sells the M916 or M917 probes they would be great for alignment testing. Australia has become a very difficult place to buy metrology equipment these days. There is no information I can find for the Metem 6 pin DIN connectors. I can reverse engineer the electronics but that will take some time and it's easier if I don't have to. The connectors look identical to your model 551 do you have any specifications for these?