What filter does a Dyson AM10 take?
None — this model has no replaceable wick or filter.
Dyson AM10, ultrasonic humidifier, tabletop, sold in white/silver and iron/blue.
The Dyson AM10 has NO replaceable wick or filter. It treats the water with UV-C light (Dyson 'Ultraviolet Cleanse' technology) before misting. There is no consumable filter to buy; follow Dyson's cleaning/descale routine instead. If a listing tries to sell you an 'AM10 filter', it is not a Dyson part.
Finding the model number on a Dyson
The AM10 is the loop-shaped Dyson humidifier, sold in white/silver and iron/blue ('the blue Dyson'). It has no replaceable filter at all — see the model page.
This entry exists so the answer is complete: if a store tries to sell you a replacement filter for this model, it is not a manufacturer part.