Plug the phone plug into the amplifier/speaker.
Attach a weight to the film canister. This will allow the film canister to sink.
Notes:
- The first couple of times the hydrophone is placed into water, a little of the oil may leak from the lid of the film canister. This oil is leftover from the assembly process. Place the hydrophone into a container of water to get rid of this leftover oil before putting it into the a fish tank, seawater, etc.
- It is important to attach a weight a little above your hydrophone. The oil in the canister allows the hydrophone to float therefore a weight (heavy rock, lead fishing weight, etc.) will enable the hydrophone to be pulled to a good depth.
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