We offer several Carat scales listed is the A&D FX-300i model that has a Super Hybrid Sensory technology that is lightning fast. This model provides quick stabilization speed with accurate weighing result in 1 second resulting in better productivity. The compact size and small footprint is something no other competitor brand can offer. The FX-i model comes standard with RS-232C interface for bi-directional communication with a PC, printer or other peripheral devices. All FX-i balances come with a 5 years manufacturer warranty.