I have an EDT 9 and its not something i recommend. It sometimes wont read stihl limited coils, even on same models just different machines. Its refresh rate is slow, screen small, very very weak inductive pick up. Get something else, anything is better than these. I took mine to the shop and the engine that it wouldnt read the limiting coil and the one it would. The techs got their edt9's out and had the exact same thing, all of them read one coil but not the other. I use my oppama at any given opportunity.