419,
Helicopter tracker and balancer/analyser
Don't have much time for egg-beaters myself, so can't really argue your wisdom !
However I bet there's a more recent version on the market that uses CF cards or something similar, the "Zing Test 1200" (wonderful name!) perhaps ? It's features include "Advanced rotor track and balance" and up to "8GB compact flash".
Zing™ HUMS 1200 Series | Condition-based maintenance programs | Mission Ready