The Microtech UTX-70 is the smallest OTF the company makes, and the name tells the story: 70 percent of an Ultratech, which 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 dual-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 knives along the way: the Dual-Fuel drivetrain for a lighter, smoother pull on the slide, and Crud Kutter grooves that break up pocket lint and debris before they can drag on the action. Bohler M390MK is now the standard blade steel, which means the smallest knife in the catalog carries the same premium steel as the largest.
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 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 among OTF knives nothing else this small is built anywhere near this well.