Davidge guarantee that all submeters meet or exceed the accuracy standards of ANSI C12.1 (2011), the national standard for all types of power meters. The standard requires that the submeters be accurate within 1% across their entire operating range. The range is a factor of 100 meaning that a 100 amp submeter will be accurate from 1 amp to 100 amps, a 200 amp submeter is accurate from 2 amps to 200 and so on.
While the guarantee is for a max error of less than 1%, most submeters have a max error less than 0.3%. It is possible for us to match a submeter to specific CTs and manually calibrate a submeter with an error less than 0.1%.