血压计

• 皿(bowl; dish)RADICAL
• 丿(drop of blood; blood drop)ASSOCIATIVE

Blood is a small red drop of liquid flowing down into a bowl—picturing blood dripping into a vessel.

• 厂(rock face; eaves)RADICAL
• 土(earth; soil; ground)ASSOCIATIVE
• 丶(small dot; weight)ASSOCIATIVE

A rock wall pressing down on the earth like a heavy object applying pressure from above.

• 言(word; speech)RADICAL
• 十(ten)PHONETIC

Calculation is using words to count numbers one by one.