If you need to monitoring SDI signal on the surface, but you have only  standard HDMI Monitor, we offer option “SDI to HDMI converter”
This device will convert an SDI signal on the surface end of the underwater coaxial cable to full HDMI 1080p signal, which is acceptable by any consumer TV or monitors with HDMI input.
Converter Support the industry’s high-end 3G SDI signal and 1.485G SDI HD signal; Support PAL and NTSC.
Auto recognizes resolution of HD-SDI, SD-SDI and 3G-SDI for input.
Full HDMI supported with embedded audio
Synchronized output audio video and audio
Powered by AC adapter directly 5V to 12V, or battery source in that voltage range. 5V AC adapter is included.
Supported Video Resolution: SD 525i, 625i; HD720P@24HZ, 720P@25HZ, 720P@30HZ, 720P@50HZ, 720P@60HZ, HD 1080P@24HZ, 1080P@25HZ, 1080P@30HZ
Audio: 48KHZ digital audio. For more information and price see our site www.diveandsee.com