Jewelers often need to convert between units for price calculations and appraisals, but some of the weight/mass units are esoteric to the industry and are not present in many calculation tools.

Jeweler's Unit Converter Lite meets that need by allowing quick conversions between the following units:

AVOIRDUPOIS (Imperial weight):
grain, dram, ounce, pound

METRIC:
microgram, milligram, gram, kilogram

TROY:
carat, pennyweight, ounce, pound

ANCIENT:
Roman drachma, Greek drachma, Israeli sheqel, Chinese tael

Jeweler's Unit Converter Pro has all these features, plus it is ad-free and interfaces with the Apple Watch for a dual-screen experience.