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Lens Hardness Tester
Function: Use 0000 # steel wool, dual-use, can be tested with steel wool or pencil to meet standards: QB2506-2001 QB/T2702-2005Testing by ste
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Product Introduction
Function: Use 0000 # steel wool, dual-use, can be tested with steel wool or pencil
Compliant with standard: QB2506-2001
QB/T2702-2005
Testing by steel wool （using 0000#steel wool） or pencil
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