testo 330 is the mutts nuts. just got mine and it's fantastic. had a testo 325 which i got rid of because back then it didn't do differetial pressure. went to a telegan sprint 2000xt - worst analyser ever! this new testo is my 3rd and even though i've only just got it (it's only commissioned 2 greenstars so far) i think it's the best one yet. hopefully time won't prove me wrong. If you're thinking of buying an analyser i would recommend the extra expense for this baby.