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This is “One of the highest-ranked models,” and is manufactured in Switzerland. The pan is made of stainless steel, which allows an even and controlled transfer of the heat, thus preventing the overheating of the oxalic acid. Oxalic acid that is overheated decays and builds formic acid and CO2 thus reducing efficacy very fast and significantly.
The vaporization of oxalic acid in beehives is a proven method of killing Varroa mites. This vaporizer comes with “side” wings that serve to keep the vaporizer from overturning in the hive. Load the cup of the vaporizer with one gram (per brood chamber) of oxalic acid (sold separately) and insert it in the hive and connect it to any 12 volt battery. Pack damp rags around the entrance and the unit. The vaporization will complete in 2 1/2 minutes. Disconnect the vaporizer and leave it in the hive for about 8 minutes more to seal in the vapors and you're finished! Remove it from the hive, dunk in a pail of water (no need to use a wet rag or sponge (but you can)) & you're ready for your next hive! If any residue remains in the cup after treatment, scrape it out with a stick or other blunt object. Remember to seal the hive for 8-10 minutes after you disconnect the vaporizer from the power source to lock in the vapors.
Oxalic acid vapors only kill the mites that are on the bees (phoretic,) not in the brood. With the hive almost broodless in late fall or early winter, that is an excellent time to treat. If the outside temperature is 40 degrees (f) or above, you can safely vaporize. You want to go into winter with mite-free hives, as the main reasons for winter losses are starvation and mites!
To treat in the summer, you must complete four (3) successive treatments, seven (7) days apart to vaporize the mites that are emerging in the brood. If you’ve supers on, you must also remove or place a barrier between your supers and brood nest. You can use coroplast (plastic sign material) plywood or cardboard as a barrier. You can replace the supers or remove the barrier 3 hours after treating.
Use appropriate protection as you should not breathe the oxalic acid fumes.
Dimensions: 14″ long from where the cord attaches to the shaft to the end of the pan. The pan is 1 7/8″ in diameter and 3/8″ deep. The “wings” that are attached to the shaft and serve to stabilize it in the hive are 3 3/8″ from tip to tip.
More information is found at Randy Oliver's site: http://scientificbeekeeping.com/oxalic-acid-heat-vaporization-and-other-methods-part-2-of-2-parts/
Watch the video: https://youtu.be/ClobU68Ekmo