This new carat scale from On Balance is professional, compact, and portable. It includes a gem tray, locking tweezers, calibration weights, and a universal USB power plug all in a zippered hard case. The Senso also can count pieces.

Max Capacity: 50g
Min Readability: 0.001g
Weighing Mode: g, oz, dwt, ct, gn
Dimensions: 138 x 74 x 45 mm
Platform Diameter: 45 mm
Display: 50 mm x 18 mm
Calibration Weights: 20g & 50g included
Power: 2 x AAA Batteries included Or Type-C USB (Cable included)
Warranty: 10 years Limited