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Use Instructions: This rubber hardness tester is a measure of sulfur rubber and plastic products of hardness of the instrument. Item Features: Easy to use, accurate measurement, easy to carry, and stable, practical and strong durability. Wide Applications: Type A is suitable for general rubber, synthetic rubber, soft rubber, poly fat, leather, wax etc. More Convenient to Use: The connecting device is more convenient to use with the frames, convenient to use. Water Proof Not Rust: Made of alloy material, water proof not rust, fine workmanship, durable for use.