OK, this is a cheaper, Do-It-Yourself option for treating hives with oxalic acid. No need for electricity or batteries. However, you will need a propane torch, preferably with an automatic igniter. Just heat up the round end, place oxalic acid crystals in the accompanying metal caps, insert into hive entrance and wait the prescribed amount of time (less than a minute). Results? Dead mites.
A way to use an oxalic acid vaporizer without electricity or batteries.