Oil level/condition sensor
Oil to gasoline proportioning device for two cycle engines
Oil-water interfacial detector
On-line fishing depth indicator
On-line fishing depth indicator with encapsulated components
Opaque aerosol container capacity indicator
Optical fluid level indicator including float with reflecting me
Optical fluid level monitor
Optical fluid level sensor
Optical fuel level sensor
Optical level detector
Optical level sensor
Optical-fiber liquid-level monitor
Orientating device for a measuring instrument
Oscillating liquid level measuring apparatus
Oscillation unit for filling level vibration limit switch
Parallelogram actuated liquid level sensor
Parasitic echo pulse rejector for ultrasonic liquid level meter
Particulate level measuring method and apparatus
Parts washer with improved temperature and pump control