Mares Neutron Dive Knife Review

Our tester mid frog kick underwater wearing the white ScubaPro GO Travel finsDIVEIN contributor Rebecca Strauss taking a selfie near a city canal
By
Andrew Goad
Our tester mid frog kick underwater wearing the white ScubaPro GO Travel fins
Staff writer at DIVEIN.com
Andy has been an avid diver for many years, honing his skills and passion for the underwater world. As an instructor, scientific diver, and technical diver,...
Rebecca Strauss
DIVEIN contributor Rebecca Strauss taking a selfie near a city canal
Editor at DIVEIN.com
Rebecca has been an avid traveler and scuba diver for many years. She began her editorial career by updating travel guides, which took her all over...
Mares Neutron dive knife, a one piece black steel design with blunt nose, serrations and line cutter notch
One piece of steel from nose to handle, with a blunt tip and a line cutting notch. Built for sawing and prying rather than stabbing, which is what most divers actually need.
Straight cutting edge and serrations on the compact black Mares Neutron blade
The Neutron packs a straight edge and serrations into a blade barely longer than a thumb, which is why it handled thin cord better than thick braided rope.
Wave shaped serrations running along the edge of the Mares Neutron dive knife
These serrations did the heavy lifting on the Neutron, chewing through thick braided rope that the straight edge would not touch.
Flat screwdriver tip and bottle opener cutout on the tail of the Mares Neutron knife
The skeleton handle doubles as a toolkit with a flat driver and an opener, useful on a boat deck long before anything goes wrong underwater.
Mares Neutron dive knife beside a tape measure showing a length just under 5.5 inches
Just under 5.5 inches total, so the Neutron is one of the smaller knives we handled and clips out of the way rather than dominating your leg or BCD.

Mares makes some of the most top-rated gear on the market, including the ever popular Avanti Quattro + fins and the Prestige SLS BCD. But they also make some of the best accessories on the market. The Mares Neutron Dive knife is one of those accessories.

The knife is made from 440 stainless steel, and features a straight edge, serrated edge, a line-cutter, and screwdrivers. While some of these add-ons might be niche, the knife itself is sharp and durable.

Let’s dive in and take a closer look at the Mares Neutron dive knife.

About this review

To help you find a Dive Knife that will fit your needs, we’ve tested, researched, and reviewed the best ones available today.
We test both in the water, diving in various conditions - and in our lab - so we can give you accurate answers on quality, performance, and the overall value.

Read about our test of Dive Knifes

Recommended in: Dive Knife

Things we like:

  • Very compact
  • Nice cutting edge
  • Great price

Things we don't like:

  • Sheath snap
  • Gimmicky accessories

Mares Neutron Spec Breakdown & Features

Officially measuring at just under 5.5 inches, the self-measured blade of roughly 3 inches makes the Neutron one of the smaller knives we tested. The small stature comes with a light weight. While the exact weight is not specified by the manufacturer, the Neutron is lightweight, despite its solid construction.

Featuring a straight edge, a serrated edge, a line cutter, and screwdriver tips, the Neutron is versatile despite its smaller size. It’s made from 440 stainless steel, meaning it can hold up to saltwater with very little wear and tear.

Mares Neutron Impressions

Bare wetsuit gloves working the Mares Neutron out of its sheath during our glove test
Our tester pulling twisted rope across the small black Mares Neutron blade

I like the Mares Neutron, but I think I like the idea of it more than I actually like the knife itself. It’s billed as a multi-tool, which I think is cool—multiple uses, one price. But then I looked at the tools offered outside of the cutting edges, and I’m not sure they are really necessary.

Let’s go through them. The screwdriver pieces seem like a good idea, but then I wondered how many times I’ve had to screw or unscrew something during a dive. Let me tell you, the answer is less than one. Well, maybe it’ll be good on the boat. Not great there either. Boats carry actual tools that fit.

Now, the cutting edges. The straight edge is pretty good. It cut through the 550 cord fairly easily, and handled the poly dock rope with a little bit of work. The serrated edge and line cutter both cut the 550 cord. The serrated edge did cut the thick braided rope though.

The Neutron is easy to get in and out of the sheath, but the snap closure gets more difficult the thicker your gloves are. I would probably slip a hair tie or some rubber tubing over it to ensure it stays locked.

Overall, even with some of the gimmicky additions, the Neutron is still a good knife. Its solid construction and nice cutting edges make it worth it. I like it as a back-up knife, and it’s so small it won’t get in the way. If you want something larger, check out the Neutron’s big brother, the Mares Maximus.

If you’re looking for a small travel knife, check out the Promate Sharp Tip Titanium BC knife. It’s small, sharp, and can attach to almost any piece of your equipment.


Do we recommend the Mares Neutron dive knife?

Snap closure and Mares logo on the fabric sheath of the Mares Neutron dive knife
Mares Maximus and the smaller Mares Neutron laid side by side to compare blade size

We do recommend the Mares Neutron dive knife, but only as a knife, not as a multi-tool, and as a back-up knife. For a multi-tool, check out the XS Scuba Mini FogCutter.

As a knife though, the Neutron is a good bet. The cutting edges are above average cutting rope, and it is built solidly from 440 stainless steel. It sells for a fair price, looks sharp, and comes from a great manufacturer.

Check out how the Mares Neutron stacks up against all the knives we tested in our knife roundup here.


Specs & Features

Fixed or foldable fixed
Blade length 3 inches (self measured) 5.4 inches (13.7 cm) total length
Handle length 2.4 inches (6 cm); self-measured
Weight not specified by manufacturer
Blade type straight edge, serrated edge, line-cutter
Blade material 440 stainless steel
Handle material 440 stainless steel
Blade tip blunt
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