text: Cheap and simple solution:\nUse a good 1.5Volt battery, connect a 2.7KOhm 1%  fixed resistor, and a linear 100 Ohm potentiometer in series across the battery. \nBetween the center tap and the "bottom" end of the potentiometer, you will get 0 .... 53 milli Volt. Use a knob and scale, and a milli Volt Meter to calibrate it.