Rob Flinn said:I have an AVO mk 3 & also a mk4. I never got round to selling the mk3. You can read what the mk4 does in the user manual on this site https://frank.pocnet.net/instruments/AVO/HR/ValveTesters/manuals/VCM_Mk-IVuser.pdf.
iT does the tests that the Utracer doesn't do like gas & leakage tests etc.
Thank you so much Rob