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The sensor I am investigating is the 1-LM11 by Omega.

I am looking at the specification at there are two metrics which confuse me, the measurement grid A is 1.5mm while measurement grid B is 2.5mm. This really doesn't make much sense intuitively while looking at the picture

enter image description here Dimensions C and D seem slightly more likely with them being 9 and 4.4 respectively. Could someone clarify what the market grid is exactly?

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The measurement grid is the actual active part of the sensor, the resistance wire that is used to measure deformation. Your picture might be a bit misleading, as it seems your ratios between dimensions are very different from those in the picture, but that's why they give you numbers--so they don't have to make a separate to-scale image of every product in the line.

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