First Article Test Tank Data Instrument housing Core with equivalent load of puck and reagents CTD 2 Dry battery packs Mooring string Anchor Shockle swivel instrument mount no EM cable Tank Depth 10.4m Top of can depth 3m Anchor mount point 0.45m Swivel 0.4m instrument can top to mount point 1.4m Shockle length 10.4 - 3.0 - 1.4 - 0.4 -0.45 = 5.15m