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The Invar Master Bar is required for verifying calibration of HM-240 Strain Gauge. Models are available in either English or metric units. The bar is made of Invar nickel-iron alloy with a very low coefficient of thermal expansion. Threaded stainless steel inserts with 2, 4, 6, 8 and 10in or 5, 10, 15, 20 and 25cm spacing are used to verify gauge spacing.
HM-241 is marked in English measurements, while HM-241F is indicated in Metric.
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