Marine Clinometer /Clinometer Dial Type Brass Dial Type Marine Nautical Brass Clinometers 180MM MODEL:GL198-CL Material:Brass Base: 7"(180MM) Dial: 5"(124MM) Depth:1-3/4"(45MM) FEATURE: Waterproof / Tarnishproof A clinometer is required for positioning a vessel on a proper trim. It also indicates the correct heel angle and is helpful in determining the appropriate locations for cargo and equipment. A pair of clinometers, one installed on the keel axis and the other on the beam axis, will give the necessary and accurate indications for adjustment of the trim angle.