Extrema Ratio Ultramarine Testudo Dive Knife

This Extrema Ratio Ultramarine Testudo dive knife includes a 15cm, part serrated blade made from Böhler N690Co.

SKU: 1794 Category:


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The Extrema Ratio Ultramarine Testudo was designed using information provided by civilian underwater operation experts and military dive teams. This has resulted in one of the most sophisticated dive knives on the market today. The Ultramarine Testudo includes a 15cm, part serrated blade made from Böhler N690Co and has been black coated for corrosion resistance. The textured polyamid handle is designed to be anti-slip and is shaped to ensure that the user can distinguish the blade end in poor visibility. This knife really is perfect for the job and comes complete with the original original heavy duty case and all accessories.

A pre-owned knife with very light use.

Additional information

New or Pre OwnedPre Owned
ManufacturerExtrema Ratio
Country of ManufactureIT
Manufacturers Part No.
Product TypeFixed
Lock TypeN/A
Blade Length (cm)
Overall Length (cm)
Blade MaterialBöhler N-690
Handle Material
Sheath or PouchNone


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