For outdoor pest control a backpack sprayer is nice. Residential size would be 2.5 to 3 gal. Berchmeir (spelling?) makes a good one. Can also be used in garages,unfinished basement, utility areas and as a spot weed sprayer.
Did you have any specific pest control activity/target in mind?
Indoors, B&G is the gold standard but very expensive. Very. There are good “knock-offs” but they are pricey too.
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