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Set of nine, screw-on type, replacement needles for use with the H-4137 mortar penetration resistance apparatus. Set includes: (in2 (cm2)) 1 (6.45), 3/4 (4.84), 1/2 (3.22), 1/3 (2.15), 1/5 (1.29), 1/10 (.65), 1/20 (0.32), 1/30 (0.22) and 1/40 (0.16).
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