The Presidium carat scale is a reliable, portable carat scale that measures gemstones in weights of up to 100 carats.  It is compact and utilizes advanced circuitry design and surface-mount technology to weigh gemstones precisely and accurately, for long periods of continuous usage.  Each scale comes with its corresponding weight reference of 100 carat for calibration. Calibration is prompted with each use to ensure consistent accuracy. Measurements can be taken in grams, carats, troy ounces, or grain.  For more tools like this portable, easy to use scale, visit Stuller.com/tools.