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Langry Sjy-1000b Penetration Concrete Strength Tester
The SJY-1000B is a penetration-nail lever tester sized for concrete strength assessment via nail-pen..
Langry Sjy-800b Penetration Mortar Strength Tester
The SJY-800B is a spring-loaded penetration nail tester for masonry mortar compressive strength, per..
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