1 catty

2 (PRC) weight equal to 500 g

3 (Tw) weight equal to 600 g

4 (HK, Malaysia, Singapore) slightly over 604 g

1 kilogram (kg)

1 to haggle over every ounce

2 (fig.) to fuss over minor matters

3 to split hairs

1 jack (for lifting weight)

1 not much to choose between the two

2 tweedledum and tweedledee

1 lit. four ounces can move a thousand catties (idiom)

2 fig. to achieve much with little effort

1 to bicker at length over a trivial matter (idiom)

1 although small, a steelyard weight may tip a hundred pounds (idiom)

2 apparently insignificant details can have a large impact

3 for want of a nail the battle was lost