锱铢必较

錙銖必較
zīzhūbìjiào
to haggle over every cent (idiom)

CEDICT

to split hairs; to fuss over minor amounts or things

Wiktionary

斤斤计较。《二刻拍桉惊奇．卷三一》：「就是族中支派，不论亲疏，但与他财利交关，锱铢必较，一些面情也没有的。」也作「铢铢校量」、「锱铢较量」。

重編國語辭典

对小事非常计较

維基詞典

Entry Composition

1 锱铢 zīzhū
  1. (literary, figurative) a small profit; a very small amount of money
  2. (literary, figurative) a tiny amount; a very small amount
  3. (literary, literally) zi (¹⁄₄ of a tael) and zhu (¹⁄₂₄ of a tael), both are small weight measures in ancient China
  4. a small profit; a very small amount of money
  5. a tiny amount; a very small amount
  6. zi (¹⁄₄ of a tael) and zhu (¹⁄₂₄ of a tael), both are small weight measures in ancient China
2 必 bì
  1. certainly
  2. must
  3. will
  4. necessarily
3 较 jiào
  1. (bound form) to compare
  2. (literary) to dispute
  3. compared to
  4. (before an adjective) relatively; comparatively; rather
  5. also pr. jiǎo