Durable and waterproof (50m) handy case enables easy water depth measurement PS-7. Equipped Float and 10 m cable enable measurement of remote location easily (PS-7FL). Easy operation and instant measurement. Press the switch on the case for 2 to 3 seconds and hold the body in the direction of measurement. Dry battery operation (S-006P). Auto-shutdown function saves the battery life. Power shuts down 10 seconds after releasing the switch.