Ground rod test Ground Rod Testing Measurement: Grounding methods, John Shook 

Testing, Ground Rod, Measurement, two resistor method, Calculations, Easy Method, NEC 250.53,A2 Electricians Need to Know: Resistor I Use: 225 Watt 25 Ohm Resister, Page 584 MC14681, 28K6295, ((Book) Newark Elements14), is $15.89, JS.