FAR 91.411(b) states that the tests must be conducted with:
The manufacturer of the airplane, or helicopter, on which the tests and inspections are to be performed.
A certified repair station properly equipped to perform those functions and holding-
An instrument rating, Class 1;
A limited instrument rating appropriate to the make and model of appliance to be tested;
A limited rating appropriate to the test to be performed;
An airframe rating appropriate to the airplane, or helicopter, to be tested; or
A certified mechanic with an airframe rating (Static pressure system tests and inspections only.)