noun
Rare technical term for a device that measures pressure. In everyday contexts, 圧力計 (あつりょくけい) is more common.
この示圧計は高圧環境でも正確に作動する。
This pressure gauge operates accurately even in high-pressure environments.
Compound of 示 (し, 'indicate') + 圧 (あつ, 'pressure') + 計 (けい, 'meter'). The exact historical derivation is uncertain, but the kanji directly reflect the meaning.