Compact Stainless Steel Underwater Shaker with measure rod
・Add on clip.
・Compact plated stainless steel underwater noise maker with magnetic device to stop unwanted noise.
・Overall length: 28cm (11") + measure rod added
・A simple shake sends sound up to 100 feet (2.5 m).
・No batteries or maintenance required.
・Practical technology favored by divers, dive masters and scuba instructors worldwide.