Weighted gauges will rock gently or make a frequent jiggling noise ... National (made by National Presto Pressure Cooker Company) Magic Seal (sold at Montgomery Ward) Maid of Honor (sold at Sears, ...

Usually testing can be done within a week. Please note the only canner that needs to have its dial gauge tested is a Presto and some older pressure canners. (The others are all weighted gauge canners ...