A multimeter is an easy prospect, right? Back in the day you could make one fairly easily with a decent panel meter and a set of precision resistors, and now a digital one can be had for throwaway ...
Saelig Company, Inc. introduced the GDM-8261A - a high precision 6 ½ digit Digital Multimeter with dual measurement displays, 11 measurement functions, and 10 highly accurate math functions (35ppm DC ...