Particle analysis system with photochromic filter

Particle detecting system

Particle evaluator

Phase detector for optical figure sensing

Phase-coded control for ring laser gyro

Photodensitometer for measuring optical fringe patterns

Photoelectric smoke detector with means for adjusting the amount

Photographic color densitometer check plate

Photomask inspection by optical spatial filtering

Photometer

Photometric liquid analyzers for use in clinical or chemical lab

Photon-counting integrating nephelometer

Plant comparator

Polarimeters

Polarization rotation analyzer

Portable instrument to determine concentration of AFFF in fresh

Portable refractometer

Process and apparatus for filament or slit size monitoring

Process and apparatus for monitoring angular orientation

Process and apparatus for sensing defects on a smooth surface