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The instrument consists of AA channeled base over which two verticals pillars are fixed. An adjustable cross plate is at the top. A dial gauge reading to .002mm X 12mm can be fixed to the top cross plate.

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It is used to measure the drying shrinkage of concrete autoclave expansion of Portland cement and potential expensive reactivity of cement aggregate combinations in mortar bars during storage on self drying.

BGI CCC-026

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Length Comparator