S seca 664 product sheet seca 664: Real comfort due to concentration on the essentials. afety, functionality, aesthetic design the seca 664 sets standards in medical weighing. Specially designed for weighing patients in wheelchairs, in rehabilitation centres, old people’s homes, in hospitals and in dialysis centres, this scale provides both its users and patients maximum comfort and safety. High capacity and easy to mount ramp. Integrated pre-TARE function. Easy to fold together and transport.