Multi-Function Inspection Gauge - Crack/Scratch/Angle Measurement Tool for Surface Defects & Size Comparison | Dual-Sided Laminated Wear-Resistant Ruler, 5PCS

ACCURACY: 5/5. Measured them and they seem to be right on target. As with tools of this type, I'd probably measure them before using in the field.EASY TO USE: 5/5. How complicated can it be? If you can use a ruler or a compass, you can use these as well.VALUE FOR MONEY: 5/5. Cost-effective and simple to use.OVERALL: 5/5. Highly recommended.

Each card is identical, all stacked neatly in a clear, translucent box. Nice box.Several measurements are helpful to the average person, and some are good for particular uses.For example, the corner radius measurement is excellent if you're making ID tags and must cut the corners to the original radius of the item you're laminating.The measurements seem accurate, but I didn't test the smallest ones as they were too small for my old eyes to see. Perhaps under a microscope, I could better assess their visual accuracy.Overall I think this is a good tool to have in your desk or kitchen for a quick measurement.

Used this to monitor the building settlement of a large garage and also structural changes occurring in my home that needed to be fortified. If you have any question about cracks appearing in a garage or home this kit will help you to determine if it is getting worse over time, or if the building has finished settling. These can be taped to a location and left in place to monitor and also acts as a reminder to check.

My interest in this specialized flexible flat plastic tool is to check cracks in concrete floor slabs that have been destabilized by tree roots. The tool provides a quality set of engineering graphics on a card of clear plastic that allows me to visually take comparison and alignment measurements. The tool works well, but I must take care to prevent getting the plastic too dirty or scratching the plastic too much. The complete set allows up to 5 tool replacements. In some situations I use the set at up to 5 different measurent locations within a given area of concrete surface. I generally use photography to document the position of the tool at the subject concrete surface location. When necessary I use a microfiber cloth to clean grime build-up from the plastic tool. The tool is unique, and valuable for anybody taking specialized engineering-type small-scale measurements of surfaces.

This tool helps identify the size and shape of cracks not only in walls but also in windshields. This is also a multi-set that comes with multiples.

I can’t speak to how useful these are for measuring cracks in concrete, but I present a different use case: drawing and jewelry making!After seeing the gaping sides these dragon scale cabochons were leaving in these earring trays I got, I wanted to test if the tray was oversized or the cabochon was undersized. This guide confirmed the former, as the cabochon squarely sits in the 25mm diameter. If you wind up with random findings and cabochons, you can test their size in the circles on the guide!It would be nice if one of the ruler sides had measurements in millimeters, but they’re both in inches.You also get a nice little carrying case which has been repurposed for storing cabochons. Jewelry makers and artists who draw tiny details will find these rulers useful, but I’d up my rating to 5 stars if there was a millimeter ruler on them!

First thing that I noticed on this card is that some units are in millimeters and some are in inches. I don't really understand this choice. If I'm using inches then I'm probably going to want to measure my cracks in hundredths of inches, not millimeters.I took a couple spot measurements with my calipers of the printing, and it seemed accurate enough for most purposes. There are a good number of reference items to use on the card, including diameters, radii, angles, crack widths, etc.The plastic film is pretty thin, so I don't expect it to hold up to long use. Comes with a case that's sized for a stack of 100, not 5.The list price of $28 feels absurd for what this is. I usually get these for free from vendors.

From the pictures and description, I had expected this concrete crack checker to be quite a bit bigger.It's barely 4" x 5" or so... or about the size of the palm of my hand!That's so small it almost makes it unusable for many uses.It's also made of quite flimsy thin plastic, and again, not quite as expected.From the illunstrations on the product page, I would have expected this to be about FOUR times the size it is (2x width and 2x height) and would have expected it be about 3x or 4x as THICK...It does serve to provide a very basic crack size check.But for this price, I surely would have expected better quality!