A low thrust pendulum at the NASA Johnson space center was used.
The best conventional Hall thruster can produce 60 millinewtons per kilowatt which is an order of magnitude more than the emdrive that was tested.
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New NASA Emdrive paper shows force of 1.2 millinewtons per kilowatt in a Vacuum and a low thrust pendulum and tests were at 40, 60 and 80 watts
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However, 1.2 mn/kW is over 2 orders of magnitude greater than other “zero propellant” propulsion methods.