American Shield High Precision Jewelry Arsenal Reloading Scale Digital Scale Gems/Jewelry Measurement Tool- Very accurate.SF002 750 grain capacity, accurate to +/- 0.1 grain, measures in grain, gram carats and ounces. Mini Designs: small as phone-sized, easy to carry. 2 AAA battery powered(included). Suitable for measuring jewelry and other small objects Material: ABS plastic shell + Stainless Steel Dimensions:6.4 x 2.3 inches / 16.5 x 65 cm (L x W)