Inclinometers » Subsea Bullseye Levels » 5648/5 - Subsea bullseye level (ball inclinometer), Ø250, range ±5°

Product Drawing (pdf 529 KB) 5648/5 – Subsea bullseye level (ball inclinometer), Ø250, range ±5°

These subsea bullseye level and slope indicators are used to level or measure the angle of subsea structures and equipment. They are designed to be easily readable by ROV’s and subsea cameras, and have been used successfully on subsea projects down to 6000m (20,000ft).


  • Background colour eliminates glare for improved visibility from ROV
  • ±5° measurement range, 250mm diameter
  • Simple mounting arrangement with 3 holes in flange
  • Type tested to 6,000m (20,000ft)
  • Scale printed on ball surface to eliminate parallax error
  • Custom built handles and bases to suit customers application.


  • Used on all kinds of subsea structures including:
  • Blowout preventer (BOP) stacks
  • Lower marine riser package
  • Pipelines and Manifolds
  • Christmas trees and Suction Piles

Product Specification

Parameter Value Unit
Diameter 250 mm
Range ±5 °
Scale Interval 1 °
Accuracy 0.2 °
Material Acrylic (PMMA) -
Maximum Working Depth 6000 m
Ball Diameter 12 mm
Dimension Value Unit
Overall Diameter 250 mm
Body Diameter 210 mm
Overall Height 41.3 mm
Flange Height 28 mm
Pitch Centre Diameter For Mounting Holes 230 mm
Hole Diameter 8.5 mm
Material Acrylic (PMMA) -
Weight 2.3 Kilograms
Parameter Value Unit
Operational Temperature Range -10 to 50 °C
Storage Temperature Range -10 to 50 °C