Scales come in a variety of styles, from sheek to discreet.  Digital scales weigh from a range of 20g x 0.001 to 50g x 0.01g to 2000g x 0.1g accuracy. Jim, Pen and Postal scales work with gravity and spring tension and are available in 10g, 30g, 100g and 300g. Calibration weights are available in 50g, 100g, 200g, 300g or 500g.