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HM-32L Lightweight Concrete Roll-A-Meter is a lightweight version of the popular Roll-A-Meter. It is a simple and accurate device for measuring air content of concrete mixes. It is required for use with lightweight aggregate concrete, but can reliably be used with any mix. The lightweight hard-anodized aluminum version is less than half the weight of earlier bronze models. The base and top are highly scratch and wear resistant, and fastened together with quick-acting stainless steel clamps. Water and isopropyl alcohol are added to zero mark on the neck, and the meter is inverted, rolled and rocked until air is removed from concrete. Percent of air is read directly from liquid level on scale.
HM-32L may also be used as a pycnometer for determining specific gravity of sand, gravel, and cement. Unit is supplied in foam-lined plastic carrying case with Straight Edge, Tamping Rod, Syringe, Baffle-Bottom Funnel, and instructions. The unit has a 130in³ (2,130ml) base volume and a maximum diameter of 8in (203mm).
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