Concrete Rebound Hammer Tester Schmidt Hammer Mechanical Strength Resiliometer Test Meter 10-60Mpa (1450-8702psi)

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I like the solid feel of the instrument, and use to test concrete structures in a broad sense

Exactly what we needed.

I liked it and expect to do the job despite of not using it yet

Pouring the footer, I wanted to confirm I have a good solid footer for the foundation. I ordered 3,000 psi, but noted the second truckload of concrete was a lot dryer as the driver didn't take enough freshwater to mix in. There is a noticeable consistency difference in the way it was pouring and spreading. I had to get the well started back up to get water added in, then it became easier. I wanted to make sure the concrete hardened fairly equally around the entire footer. This Schmidt Hammer rebound tester pulled through. I first tested a couple of days after pouring, then again a little over a week later. The average number didn't change much, other than one really low at 12, but that was near a crack. It states you should let the concrete cure for so many days to get a more accurate reading. Drop the lowest and the highest readings, then average the remainder. Most tests were in the low 20's, this calculated out to just over 3,000 psi, basically 3,000 psi. Warning, do not put this against your hand, or any other part of your body! At first, I thought you had to push the plunger in to set it, boy was I wrong! I found out the hard way that it pushes in against whatever you are pushing it onto, then quickly releases for testing. Ouch! I think I cracked a bone. I test the foundation blocks, but do not know the rated strength of the blocks, but they were fairly consistent. I did not test asphalt or any other material it is capable of. I would say this is a pro-grade tester, not really for a DIY'er unless you are the type of person that has to confirm and verify as I do as a real estate appraiser.

This Antstone Concrete Rebound Hammer is sturdy and well built. I ordered this concrete strength testing hammer because I had a slab poured to park my camper on. I didn’t think the contractor did a good job with the cement but I had no way to test or prove my assertion. When the forms were built for the slab the level of the rebar was not consistent throughout. The front part of the slab was shallower and the rebar was laid from the back of the slab to the front with an uphill slant. From the point that the rebar sloped uphill the concrete began to get thinner and continued to do so toward the front of the slab. In spite of my pointing out that thinner concrete was more likely to crack in the long run the contractor did not fix the problem before pouring. I am happy to report (thanks to this Concrete Testing Hammer) that the contractor was correct and the slab is efficiently strong from the front to the back. This is a great tool for industrial purposes and/or cement contractors and once in a while a person who needs reassurance that the job they paid for was correctly done. Highly recommended!

This item sems to work reasonably well. I would like more documentation un usage and calibration. I have found some information on the internet for other testers that is most likely applicable to this unit but I would prefer it comes from the seller/manufacture.

So far I've only tested my basement floor and it seems that it is 2700 psi concrete. I believe this was very common for a house built in 1960. I have not tested it yet on a concrete with a know value, but will update the review once I do. Very easy to use tool. I really like the concept and hope that I find it's accurate.