A remarkable money-saving instrument that provides an accurate assessment of airborne contamination. Measuring to .3 microns, this hand-held unit samples air in 1/10 of a cubic foot in one minute, using a built-in laser to detect quantities of pathogen sized particles. (Laser life expectancy: 30,000 hours) Ideal for not only measuring clean-room integrity and scanning HEPA filters, the Laser Particle Counter is exceptional in its usefulness for tracking vectors of contamination. This portable unit has a rechargeable internal battery which allows for 3.5 hours of continuous operation. Paul Stamets notes, "This is the single most valuable tool I have used in nearly 20 years of tissue culture."