Underwater compass ruler for precise ROV measurements down to 150 m depth

The QYSEA Compass Ruler for the FIFISH V6 series is a compact underwater measuring tool for professional ROV inspections, damage documentation, and structural inspections . Mounted on your FIFISH V6, V6S, V6 Expert, or V6 Plus, the compass ruler allows for the precise determination of distances, crack widths, component sizes, or fouling directly in the live image – ideal for harbor facilities, locks, bridges, pipelines, or aquaculture.

The ruler has a measuring length of up to 5 inches and a high accuracy of ± 1 mm . Thanks to its anodized aluminum housing with near-neutral buoyancy, the tool remains stable in front of the object without affecting the ROV's balance. With a depth rating of 150 m and an operating range of -10 to +60 °C, the Compass Ruler is perfectly designed for continuous, professional underwater use.

Key features of the QYSEA Compass Ruler for V6 series

• Precise underwater compass ruler for FIFISH V-series (e.g. V6, V6S, V6 Expert, V6 Plus)

• Ideal for measurements and documentation during ROV inspections

• Measuring range up to 5 inches – perfect for crack widths, gap dimensions & object sizes

• High measuring accuracy: ± 1 mm

• Depth Rating: 150 m – suitable for demanding dives

• Robust material made of anodized aluminum , with near-neutral buoyancy.

• Operating temperature −10 to +60 °C – for cold and warm waters

Scope of delivery

• 1 × QYSEA Compass Ruler for FIFISH V-Series (V6-Series compatible)