Tradeshow Giveaway :: GEOS Laboratories measurement card for registering cracks in concrete structures. A gadget must be many things, but useful in the first place. This credit card sized tool strengthens the brand of GEOS Laboratories as an independent and reliable partner in the testing of raw building materials. 
The measurement card fits in your wallet so you can always have it close at hand. The opening on the side lets you measure cracks in structures in a more precise way.
Microscopic recording of fly ash which was used on the back of the measurement card.

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