Length Comparators

Used for measuring the length change of hardened cement paste, concrete and mortar and also due to potential alkali reactivity of cement aggregate combination in course of time.
The apparatus comprises the following :-
One frame consisting of one base plate, two pillars and a cross-bar. The cross bar is adjustable up and down on the threaded pillars.
One dial gauge, least count 0.002 mm, travel 5 mm which can be fixed to the cross bar. The plunger of the dial gauge has a concave spherical seating which sits over the reference studs of specimen bars while taking observation.
One reference bar of stainless steel with insulated handle.

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