Ferti-lome Air-O-Matic Hose End Sprayer

Dilutes as it sprays.  Measures teaspoons and tablespoons per gallon simply by setting the dial.  No mixing.  Unused insecticide or herbicide can be poured back into original bottle.  Sprays up to 30 feet.  Built in anti-siphon device.  Most agree its the best hose-end sprayer available.