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UnderWater Applications has a small doppler machine (Mini Dopplex D900) available for a good price ($595 with one probe and additional probes at $295), The size makes it very attractive for travel/boat use (5.5"x2.9"x1.1") and it's powered by a 9 volt battery. Leaving aside why I would want to measure postdive bubbles (which I'm willing to discuss), has anyone actually used this machine or compared it with standard or other portable dopplers? UnderWater applications (508 628-9520) recommends a 2MHz probe for precordial (heart) observations and a 4MHz probe for subclavian measurements. The manufacturer recommends the 2MHz for fetal heart monitoring - not a likely use among sensible women divers, but I suppose this could also be used to measure cardiac bubbles. I don't really know. Do you have any opinions about which or other probe(s) would be most useful for detecting silent bubbles in divers doing 4-5 dives a day in the 80-150 fsw range for 10 or more days. My choice would be to do subclavian measurements, if you think this is the optimum site. Many thanks for any info and safe diving Peter Heseltine heseltin@hs*.us*.ed*
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