It Is Used To Measure The Drying Shrinkage Of Concrete Autoclave Expansion Of Portland Cement And Potential Expansive Reactivity Of Cement Aggregate Combinations In Mortar Bars During Storage, On Self Drying. Specifications : The Instrument Consists Of A Channeled Base Over Which Two Vertical Pillars Are Fixed. An Adjustable Cross Plate Is At The Top. A Dial Gauge, Reading To 0.002 Mm X 12 Mm. Can Be Fixed To The Top Cross Plate. The Plunger End Of The Dial Gauge Can Be Located Upon A 6.5 Mm. Dia Ball Or Other Reference Point Cemented In The Specimen. On The Base There Is A Similar Recessed Seating In Which Can Be Placed A Second Ball Or Reference Point In The Specimen. Complete With A Stainless Steel Standardization Bar With Insulated Grip And With 6.5 Mm Dia. Balls Mounted In The Ends. The Unit Can Be Supplied With A 0.0001Inch X 1/2Inch Dial Gauge At Extra Cost.