FAST O2 portable meter
 

anyone have experience with one of these meter? they seem portable enough to test a boat "with drypipes" by sticking them up the pipe and dry. The record 25 minutes of rpm and air/fuel mixture with 2 sensors (1 on each motor) and then can be played back.
Seems an easier methos than plug checking to tune boats on the water.
Dog
LINK http://www.fuelairspark.com/Base/Ins...eter170450.pdf