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The Ohaus Ruby compact jewelry scales are dependable and versatile with four different weighing units including troy ounces and pennyweights. The Ohaus Ruby scales come standard with batteries and a power adapter, for weighing where you need it, and a stainless steel weighing surface. The JR2500 and JR300 are designed for easy use and built with overload and RF protection. These jewelry scales are also lightweight with a low profile and operate up to 300 hours on a single set of batteries.