Apply Oxalic Acid treatments to you colonies like the pros; fast and easy.  Plug it into an inverter, generator or house current.  This 110volt, 250 watts, and 2.2 amp electrical appliance take approximately 2 minutes to heat up to proper vaporizing temperature.  Place the correct dose in white lid, place on the bowl, insert into the hive and turn over to vaporize the acid.  Openings in the hive need to be sealed and honey supers removed. Wear respirator and gloves when applying oxalic acid.