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The new Met One 3400+ series particle counters continue to prove popular here and globally with sales continuing to rise sharply around the world. These high-quality feature-packed particle counters are simply the most advanced portable particle counters of their type on the market. The image in this post is one of the new 3400+ units (just out of its box) alongside a Met One HHPC handheld particle counter, both instruments recently being purchased by one of Australia’s leading organizations.