Cordless oxalic acid vaporisers that knock Varroa on the head. Fast, in the field, no power point required. The InstantVap range runs from small backyard setups right through to commercial runs, and the cordless models fit the 18V battery brand you already own.
Not sure which one suits your hives? The Lite keeps it simple, the Compact is the balanced middle, the Turbo moves fast through big numbers, and the Original 12V runs off 12V power.