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1 5 stars by out of JVC on March 15th 2014
RAE Systems QRAE 3 - 4 Gas CO, O2, LEL, H2S Diffusion Gas Monitor- M020-21111-111
Length of ownership: 1 month-1 year
Pros: Ease of use, remote viewing, proven technology used by Homeland Security, First Responders, Fire Departments and many other fields
Cons: a bit higher price than standard 4-gas, limited to standard 4-gas (at present time), short learning curve for new wireless technology