Large LCD display; Auto- calibration Auto-counting; Auto-tare Auto-backlight; Unit change Easy for handle; Overload protection; Low voltage protection; Unit transformation:g,oz,ct,lb,tl,dwt. TYPE HJ-1000A HJ-1000B HJ-1000C Metage Range(g) 300 500 1000 Reading Precision(g) 0.01 Repeatabibity(g) ±0.01 Linearity(g) ±0.02 Ambient temperature(℃) 5-30 Warm-up time(min) 10-20