30cm Rigid Machinist Rule Ruler Hardened Spring Steel 4R Graduations in 0.3cm , 0.2cm , 0.08cm and 0.04cm MRSAE-12

Well maxe ruler. Easy to read and accurate.

Excellent quality ruler!

I ordered this rule to replace the Office Depot metal ruler I've been using for years. On first examination it is plain that this is a serious tool. I was immediately impressed by the sharpness and readability of the scribed markings. The first thing I did, though, was put it side by side with my Starrett combination square and found it is absolutely spot-on accurate. The measurements appear in four different scales, one on each edge and they appear as eights, sixteenths, 32nds, and 64ths. This is different than on other rules and does require some adjustment on the part of the user. Measurements begin at the end of the rule so there is no "dead spot" to account for. Other reviewers have suggested it should have a hanging hole, and I agree, but I also own a drill press, so ... :-) I like this rule well enough that I ordered the 6" model to keep in the chest pocket of my shop apron.

This is decent for the price. The scale is accurate and well etched, and in most details it's pretty good. The middle sections are fine for setting spring calipers or taking measurements under magnification. The ruler is about 0.01" short overall though, with that shortness all being in the first gradation on the beginning of the scale -- meaning that the first 1/64" mark is only 1/128" or so. This appears to be due to a poor cutoff (dull stamping due?). There is a slight bevel on the short end of the ruler. It's possible I got a particularly bad one -- it's really not with the effort to return it and see at this price. I have uses where it just won't matter. This is illustrated measured in the photos by placing on a surface plate, next to a another steel rule, shimmed to bring their thicknesses in line, and using a precision ground block on one end to keep them even. Microscope at 40x shows the mismatch. The end difference is visible with the naked eye. I used a gage block stack to confirm that the Taytools rule is the one that is off. Now, is it reasonable to literally put a $10 under a microscope? Maybe not. For most applications this thing will work fine. It's a surprisingly large error in a steel rule though, even at a cheaper price point. While these aren't precise tools in terms of gradation, they are usually surprisingly accurate. I've bought a lot of rules from Taytools over the years. This is the first noticable large error I have seen. Again, it's reasonable for most uses, and the price is good. If you plan to use this for precision stuff though, I'd look elsewhere in their line up (and I do absolutely recommend this brand) -- they sell a fair number of steel rules at about 2-4x this price, and the quality difference is pretty visible IMHO. If you are using this for drawing straight lines on paper, or you are marking steel to cut with an angle grinder, this is a great choice. The extra precision of a better ruler would be a waste in that case.

A new one for a second workbench. Nice and solid. Nice etching and marking. No metric markings, just so you know...