PMP112 is a non-directional power meter, or power meter probe, designed for measurement of powers up to 100 kW in 900 MHz industrial applications with a wave travelling in a waveguide in one direction only. PMP112 is designed to be installed on a lowered-height WR975 (R9) rectangular waveguide that serves as a quarter-wavelength transformer connecting a standard R9 to a typical circulator waveguide. A standard application is for accurate measurement of the power absorbed in a circulator waterload.