It Is called 15 cm extensiometer. I! is made of firearm metal andcomprises of an exact pivoted ring with stainless steel setscrews held properly by a spring. The augmentation is on a dialgauge. I! Is reasonable for 15 cm x 30 cm tube shaped test molds. I! has a control bar settled on the two finishes of the expansion rodwith screws. At the point when the test example has been held by thestainless set screws the control bar is discharged and theinstrument Is in activity. The augmentation is perused, while thetest example is under pressure test, on the dial gauge,which' is settled to the extensometer. The dial marker whichreads to 0.0005" or .01 mm measure demonstrates the averageextension on the sides of the example.

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