Schmidt OS-120
The soft material specialist: Schmidt OS-120 Pendulum Hammer
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Unique Pendulum Design: Unlike axial rebound hammers, the OS-120 uses a pendulum system specifically engineered to test softer materials without damaging the surface, such as lightweight concrete, gypsum boards, or joint mortar.
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Low Strength Measurement: It is the only instrument capable of accurately evaluating compressive strengths below 5 MPa (725 psi), a range where standard rebound hammers cannot operate.
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High-Resolution Reading: Features a large semicircular scale that offers superior resolution, allowing detection of subtle variations in hardness during early setting stages or in delicate mixes.
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Application Versatility: Ideal for determining safe formwork removal times (early strength development estimation) and classifying mortar quality in both old and new masonry inspections.
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