Wondering if anyone has tried the device demonstrated in the video link below. It's a varroa sampling jar very similar to those used for an alcohol wash except it uses CO2 to sedate a 200 bee sample. After sedation, the varroa, which are also sedated, are shaken off the bees and fall through a screen mesh for counting.
https://www.youtube.com/watch?v=CIHexu7M5wI
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