Electronic Flowmeter combines a programmable electronic display and specially designed flowmeter with electronic sensor and underwater cable that allows users to show flow-rate data in real time. The battery-operated, waterproof unit displays current velocity in cm/sec., ft./sec., m/sec. or knots, total distance traveled or volume in cubic meters. Other features include an event timer and external start/stop switch. Uses three 9-volt transistor batteries, which are included.