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HM-24 Brass Calibrator for concrete air meters provides a speedy check for accuracy of concrete pressure meters in the field. It is made of precisely-machined brass and has a 0.5in (13mm) thick base. With a calibrator in the water-filled base, the air meter gauge should read 5% air. Two calibrators can be used in a 0.25ft³ meter for a 10% air reading.
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