TOODOO 4 Pcs Pocket Ruler 6 Inch and 12 Inch Metal Rulers with Inch and Metric Graduation Stainless Steel Precision Measuring Tool for Engineering, School, Office

A compact, no‑nonsense measuring kit I actually reach for

I like simple tools that do their job without fuss, and that’s what I found in this four‑piece set of TOODOO pocket rulers. Two 6‑inch/150 mm rules and two 12‑inch/300 mm rules cover most of my daily measuring tasks in the shop, at the desk, and around a 3D printer. After several weeks of use, they’ve become the rulers I stash everywhere so I always have a straightedge and scale within reach.

What’s in the set

You get four stainless steel rulers: a pair of 6‑inch and a pair of 12‑inch. Both sizes carry inch and metric graduations, and the back includes quick conversion tables—handy when you’re bouncing between metric prints and imperial stock. The 6‑inch rulers also come with sliding, detachable clips that let you take quick depth or height readings.

There’s no pouch or sleeve. They arrive stacked in a simple sleeve, which keeps costs down but means you’ll want to store them thoughtfully to avoid scratches if that matters to you.

Build and finish

These are stamped stainless steel rules with etched, black‑filled markings. They’re corrosion resistant and wipe clean easily. The 12‑inch rules are thin enough to be lightweight yet rigid enough to work as a straightedge without chattering or buckling. The 6‑inch rules feel slightly thicker relative to their length, which makes them particularly nice as pocket straightedges.

Out of the box, the edges on my set were a touch sharper than I’d prefer. Not dangerously sharp, but enough that I noticed when pulling them from a pocket or sliding the clip. A few light passes with 600–800 grit paper along the long edges knocked the burrs down without spoiling the straightness. If you’re planning to keep one in a shirt pocket, I’d do the same.

The sliding clips are stamped steel with a springy tension. One of mine was too tight at first; another was looser than I like. Both were easy to correct: a tiny bend in the clip’s legs adjusted the friction, and a drop of dry lube in the slot smoothed the travel. After that, they stayed put where I set them.

Legibility and graduations

The etching is crisp and the black fill provides good contrast. On the imperial side, the 6‑inch rulers run down to 1/64 in. Those divisions are necessarily fine—great for precise layout, but you’ll want good light or readers if your eyes aren’t keen. The metric side uses clear millimeter marks with longer ticks at the centimeter marks, and the 12‑inch rules mirror that clarity.

Because the markings are etched and filled rather than simply printed, they don’t smudge with solvents or wear off under normal use. I’ve scraped hot glue, cyanoacrylate, and printer residue off them without lifting the text.

The conversion tables on the back are straightforward—common metric/imperial relationships that save me a phone glance. I like that they didn’t cram in a novel’s worth of data; just the bits you actually reference.

The clip as a depth/height gauge

The sliding clip is the 6‑inch ruler’s secret weapon. I use it often:

• Checking printer bed level and nozzle clearance when I don’t want to break out feeler gauges
• Measuring mortise depth and pocket holes where a caliper’s jaws won’t reach
• Setting router bit or table saw blade height by referencing off the bench

Once I set the clip, it doesn’t drift under normal handling. It’s not a replacement for a dial depth gauge, but it’s fast and “good enough” for setup work. If you want to use it like impromptu calipers or a small square, it can pinch and compare thicknesses, but the lack of a true 90° reference and the variability in clip tension means I treat that as a convenience, not a primary function.

Accuracy and straightness

I checked each rule against a known straightedge and against a calibrated caliper at several points:

• Straightness: no light gaps against a precision straightedge over the full length of the 12‑inch rulers. Edges are true enough for scribing.
• Length and scale: over 6 inches, the divisions on my set agreed with a calibrated caliper within a hair under 0.005 in. Over 12 inches, cumulative error stayed within about 0.008 in (≈0.2 mm). That’s perfectly acceptable for layout, woodworking, model making, and printer setup. If you’re doing metrology‑grade work, you already know you’re shopping in a different tier.

Importantly, the zero points on both ends line up cleanly; there’s no goofy offset at the nose that some cheap rules suffer.

Day‑to‑day use

I keep one 6‑inch ruler in my apron pocket and one next to the printer. The pocket rule is ideal for quick layout lines, verifying dowel sizes, and checking the depth of small holes. The clip has saved me trips to the toolbox more than once.

One 12‑inch ruler lives at the bench for machine setup and cabinet parts; the other sits at my desk, where it’s a dependable straightedge for cutting paper and aligning drawings. Because the edges are metal, utility knife cuts won’t chew them up like plastic rulers—just mind your fingers.

The stainless finish holds up to sweat and shop grime. I’ve had no rusting, even after an accidental week sitting under a cup that sweated onto it.

Limitations

• Edge finish: plan on a quick deburring session. It’s a two‑minute fix, but worth mentioning.
• Clip consistency: expect to tweak the sliding clips for your preferred tension. It’s easy, but not turnkey perfect. If you intend to use the clip as a precise measuring carriage, keep in mind there’s no vernier—your accuracy will rely on your eye and the clip’s snugness.
• Ultra‑fine readability: the 1/64‑inch ticks are tiny. If you routinely read those marks, good task lighting and magnification help.
• No protective sleeve: if you toss all four in a drawer, they’ll scuff. Functionally irrelevant, cosmetically noticeable.

None of these are deal‑breakers given the price and purpose, but they form the difference between this set and premium machinist rules.

Who it’s for

• Makers and woodworkers who want multiple rulers stationed around the shop
• Students or office users who need a durable straightedge with both metric and imperial
• 3D printing tinkerers who will actually use the clip for quick depth checks and bed leveling
• Anyone who switches between units and appreciates having conversion tables built in

If your work demands certified accuracy or you need dead‑flat edges as reference surfaces for machining, you’ll be better served by a higher‑end rule from a precision brand. For everyday layout and measurement, this set hits the mark.

Value

The quartet format is the real win. I don’t baby these; I leave them where I’ll use them. Having two of each size means one can live at the bench while its twin rides in a bag or drawer. The stainless construction, etched markings, and dual‑scale layout all punch above their price point. The trade‑offs are finish details you can address yourself.

Recommendation

I recommend the TOODOO pocket rulers as a practical, budget‑friendly measuring kit for everyday shop, office, and maker use. They’re accurate enough for layout, tough enough for knife work, and the 6‑inch clip adds genuine utility for quick depth and height checks. Plan on easing the edges and tuning the clip tension to your liking, and you’ll have four dependable rulers you won’t hesitate to put to work.