The EIA standard resistance types such as E6, E12, E24, E48, E96, E192 etc.
Tolerances: E192 = 0.5%, E96 = 1%, E48 = 2%, E24 = 5%, E12= 10%, E6 = 20%
When enter desired value is 20, the resistance type is E24, then upper entry is 22, lower entry is 20.