Labotronics Portable Oil Particle Counter evaluates oil cleanliness with a 0.8–500 µm measurement range and ≤10% resolution. Oil Cleanliness Tester uses a photoresist measurement principle and laser sensor to detect suspended particles, while the metering pump controls sample intake. Manufactured for petroleum, chemical, and electric power industries, it supports ISO 11171:1999-based contamination testing with built-in data analysis and calibration curves.