Measure test corporation offers particle counters. Most airborne contaminants that could affect a painted surface are not visible to the naked eye until they settle on that surface, a costly contamination that can be avoided. Airborne particle counters are useful to detect small particles and locate their source. By knowing the exact source of contaminants, controlling them become easier. A laser particle counter counts airborne particles and displays the results in counts for each size range specified. Based on the input received from the major automobile paint booth companies, it appears that the 10 microns size range is visibly noticeable, and thus, met one, usa, has produced special size ranges for its particle counters, to accommodate the paint booth industry. The most popular model [illustrated] is available in 4 size ranges of 0.5, 1, 5 and 10 microns. These are being used by general motors, ford motor company, honda motorcycle, and harley davidson.