1 mL each of these mixtures.
31804: Caffeine (74051-80-2)
caffeine at 5µg/mL in water
31803: Caffeine (74051-80-2)
caffeine at 25µg/mL in water
31802: Caffeine (74051-80-2)
caffeine at 125µg/mL in water
31801: Caffeine (74051-80-2)
caffeine at 250µg/mL in water
31800: Caffeine (74051-80-2)
caffeine at 500µg/mL in water