Might want to check this out...
Your source for Oxalic Acid Vaporizers
How is this project going? I have a theory I am working on based on hive density and honey storage, I would be interested in buying or funding a couple of units that could do weight and number of flights type checks Daily. Not my area of expertise. I have 4 scale hives now, but the old time units with weights, and they sure don't count bee flights. It would be really cool if you could do something on all the hives on a 4 way pallet.