Gc-l, gc-s, pc200 and pe200 is plastic housing with ss bracket; Hf-s, hf-l, hc200, he200 is 304 ss housing High a/d conversion technology; with readability 1/40000(approval resolution is 1/6000) Gc-l, pc200, hf-l, hc200 display 6 digits 1'lcd and 21 status indications; Gc-s, pe200, hf-s, he200 display 6 digits 1'led and 10 status indications; Interface: 2 rs232 can connect printer, remote display, pc separately Units: kg, g Power supply ac 230v 50/60hz; built-in rechargeable battery 6v 4ah; Load cell connection up to 8 at 350 ohm (4 wire and 6 wire) Extend optional : 4 set points output control; wireless box Software: Linear calibration Virable of communicate function Quick keys to set the parameter more conviniently