The Fisher Impulse AQ is a new pulse induction (PI) metal detector with an expected released in 2022. The Fisher Impulse AQ is part of a series of new pulse induction detectors from Fisher Research. The AQ (AQua) is a waterproof model intended for beach and water hunting. Pulse induction technology offers extreme performance on highly mineralized beaches that inhibit the depths attainable with VLF metal detectors. The AQ was released first in 2020 as a limited production model, the Impulse