Dosing meter for cocktail in stainless steel. Two measures 2 cl. and 4 cl. A cocktail jigger is a shot or cocktail measuring cup for bartenders, ranging in sizes of 0.5-2.5 oz. Conversion, 1 oz is equal to just under 30 mL, which means 1.5 oz is just under 45 mL, and 2 oz is just shy of 60 ml.