Use SP Scientific's Hydrogen Peroxide test kits to verify your hydrogen peroxide is below certain levels. Our test kits are based on inexpensive self filling ampoules ...detectable levels as low as 25 ppb. We have Thiocynate and Blue-DPD(tm) methods. Hydrogen Peroxide page http://sp-scientific.com/analytes/h2o2.htm We manufacture the highest quality self filling...