Profile: A V M Instrument Co., Ltd. is a designer and manufacturer of radio telemetry receiving & transmitting equipment. Our radio transmitters are electronic devices that emit a pulsed radio frequency(rf) sig-nal. Our null-peak switch box is a cast aluminum box with two antenna input jacks, and one output jack for attachment to a radio receiver. Our pulse interval timer(PIT) is a receiver accessory that receives its input directly from the audio output of any receiver through the headphone jack, and it is also used to determine temperatures. Our CT collar is a light-weight plastic collar with a self-locking mechanism.