Trouble with the Anton is that they not only charge prohibitive amouts for recalibration, but they also were taking 3 weeks to turn the thing around. The sensors also seem to have a knack of dying bang on two years - so accurately that I phoned them up and accused them of including the date the things died in the on-board software. An accusation they vehemently denied. Eventually traded it for a Kane which I am so dependent on I have forgotten how to use a U-guage. However the Kane printer is a pain. Used a newer Anton on my reassessments last week (has it really been five years?) and the printer takes about 2 secs to print an analysis. Also I believe that the Anton has a good PC hookup which my Kane lacks and which I would find useful. I believe the Kane is better unit if you are Oftec and occasionally stick the probe into a flue without doing a smoke test first.