Standard hardness blocks are calibrated test specimens with predefined hardness values, used for the maintenance of hardness testing machines.
According to industrial standards such as JIS and ISO, users of hardness testing machines are required to perform regular inspections-such as indirect verification and daily checks-using these standard blocks.
Therefore, standard hardness blocks are essential tools for verifying whether hardness testing machines are functioning correctly.
YSTL's high-accuracy hardness standard blocks are widely used around the world, thanks to their excellent hardness uniformity-developed in Japan and recognized internationally-and their compliance with global reference standards.
