These digital scales weigh from 0.1gms to 500gms and will require 2 x AAA batteries.
Great for weighing out small quantities of resin - place an empty cup on the scales and add drops of resin to the required quantity.
The M button is for setting the unit of measurement (e.g. grams). The T button is for tare (this resets the zero of the scale display when an empty container is placed on the weighing platform, in order to subsequently display only the weight of the contents of the container).