Wohler H 420 Handy Viper with digital distance measurementThe Wohler H 420 Handy Viper is the perfect tool to clean flue gas systems or ductworks. The digital distance measurement allows you to know how many feet into the flueway or ductwork you have traveled. Instruments Downloads Technical Data with digital distance measurementGFK-rod 0.28\" Ã and and fast change star holder (wihout stars and threaded brushes)

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