The SURVEYOR Moisture Alarm, Vacuum Valve & Pump for Nikon D7100/D7200 from Aquatica offers an added level of protection to the underwater photographer. The SURVEYOR circuitry integrates a water detection function that remains on constant duty when a battery is inserted. Should the slightest amount of water make contact with the sensor probes, it will trigger an alarm using both an audible signal and a rapidly flashing red LED to visually attract your attention. Adding the vacuum pump and pressure valve to your housing will make it possible, by creating a vacuum inside the housing, to fully test its sealing integrity. Once the easy-to-follow procedure is completed, a green LED blinking every five seconds will inform you that your SURVEYOR system is monitoring your camera housing and you're ready to dive. In the event that sand, hair, or other foreign matter would compromise the housing sealing integrity, the SURVEYOR warns you with both an audible signal and a rapidly flashing red LED signal.
This kit includes the moisture and vacuum sensor circuit, a pressure valve with retaining nut, a vacuum pump, mounting hardware, a container of O-ring lubricant, and a CR2032 battery.