STANDARD BLOCKS
FOR HARDNESS
- ISO 9001, ISO/IEC 17025 -

Since 1952

Reliable Precision, Standard Hardness Blocks

Yamamoto Scientific Tool Laboratory (YSTL), founded in 1952 in Funabashi City, Chiba, was the world's first manufacturer dedicated exclusively to producing standard hardness blocks. Since then, YSTL’s hardness blocks have been widely used across Europe, the Americas, Australia, and Asia, earning a global reputation for exceptional quality. As a company serving customers worldwide, we will continue to expand our international presence by strengthening technological collaboration and building closer partnerships with overseas distributors to further broaden our global sales network.