Funny calibration guide from timemore: No of bits of ADC is more important Usually it's 24 bits eg in HX711, looks like this 24 bit ADC will give about 14 to 15 noise-free bits. ie range is say 2^14 to 2^15 usable. Arduino forum Eg a 0.01g minimum gradation The range is theoretically 0.01 to 163.84g, or 327.68g so if it can measure up to 200g, the repeatability in this range is pretty safe. Min grad can be misleading 起稱範圍 is more important See reply below: Eg this Balance claimed a 0.001g (1mg) But initial is 0.005g If possible, choose one with one more decimal digit. Eg if you want to measure up to 0.01g, choose one that displays 0.001g Btw, those cheap balance( under¥100), most can only repeatedly measure up to 0.01g, even it says 0.001g accuracy The weight 砝碼 provided with the kit is usually 100g ,M grade. This is pretty meaningless(~¥7) But if you want to measure 0.1g or less, better to use at least F2 grade weight Hysteresis of load ...