The Surfmaster PI Pro is a Pulse Induction detector, waterproof (10 metres) for use on the beach and in the surf. There is no form of discrimination but the ability to punch through the salt wet sand is its strong point. The new gain control allows the operator to adjust the system gain to its maximum level for total flexibility. Every beach is different, and now your gain can match the beach you are detecting. Warranty: 1 year. Weight: 1.73kg.