The Microtech UTX-70 is the smallest member of the Ultratech family, and the name tells the story: 70 percent of an Ultratech, which in Gen IV form works out to a 2.5-inch blade in a 6-inch package that weighs a scarcely believable 1.4 ounces. It vanishes into a watch pocket, rides a keychain, or clips in like a full-size knife, and it is the Microtech people buy "just to try" right before it becomes the one they carry most.
Do not mistake the size for a toy. The mechanism inside is the same double-action system as the rest of the Microtech lineup, machined in the USA to the same tolerances, and it fires with a snap that startles people twice its size.
The current Gen IV grew slightly to hit its 6-inch overall length and picked up the technology from the flagship Ultratech along the way: the Dual-Fuel drivetrain for a smoother, more consistent pull on the slide, and the Crud Kutter switch platform that breaks up pocket lint and debris before they can drag on the action. Bohler M390MK is now the standard blade steel, which means the smallest Ultratech carries the same premium steel as the largest knives in the catalog.
The double-edge dagger is the signature look at this size and fills most of the grid, joined by single edge, tanto, and Spartan grinds in plain, partially serrated, and fully serrated edges. Anodized and distressed handle finishes run from tactical black and OD green into orange, violet, blue, and merlot, and you can see exactly what that M390MK blade is made of in our comparison of every major knife steel.
The ladder question at the small end comes down to intent. The UTX-85 carries a 3.1-inch blade at 3.1 ounces, enough knife to be your only knife; the UTX-70 gives up six tenths of an inch and more than half the weight to become the knife you forget you're carrying. If it will live on a keychain, in a fifth pocket, or in a small bag, the 70 is the answer, and if you want to go smaller still, the Exocet drops under the two-inch mark. Among OTF knives, very little this small is built anywhere near this well.