硬度計是測量物體硬度的儀器，表示材料抵抗硬物體壓入其表面的能力。它是金屬材料的重要性能指標之一。一般硬度越高，耐磨性越好。根據所測硬度單位：洛氏硬度計、維氏硬度計、顯微硬度計、布氏硬度計、邵氏硬度計、巴氏硬度計、里氏硬度計、韋氏硬度計、肖氏硬度計、布洛維硬度。根據使用方式：便攜式硬度計、臺式硬度計。

進口硬度計美國Check-Line AD-300型硬度計專為測量硫化或熱塑橡膠，彈性體，軟塑料和硅產品的硬度而設計。

The Check-Line AD-300 precision durmometer is designed to measure the hardness of vulcanized or thermoplastic rubbers, elastomeric or soft plastic materials and silicon products via indentation resistance. 

The Checkline AD-300 durometer meets the requirements of most international standards, including:

• DIN 53505 (A, D)

• ISO 868 (A, D)

• ISO 7619 (A, AO, D)

• ASTM D 2240 (A, D, C, O)

The AD-300 is German-engineering with the highest build employing an ultra-low friction movement and an indentor machined to the highest standards. Together with the ergonomic enlarged foot this enables you to take highly accurate and repeatable measurements. 

The AD-300 Hardness Tester is available in Shore A, D, C and O scales 

Hardness readings are displayed on an easy-to-read analog scale. An optional MEMORY POINTER holds readings until manually reset, allowing the operator to concentrate on the measurement task. The AD-300 Hardness Tester will be delivered with operating instructions, carrying case and manufacturer's certificate. A full calibration certificate can be ordered optionally.