The model numbers appear to be 502, but the graphics are faded. One is marked off Percent Power 0 to 120% and the other is marked off in several scales as follows: 0 to 10, 0 to 5, 0 to 2.5 and 0 to 150%.
The model numbers appear to be 502, but the graphics are faded. One is marked off Percent Power 0 to 120% and the other is marked off in several scales as follows: 0 to 10, 0 to 5, 0 to 2.5 and 0 to 150%.