The 12L Marolex Back Pack (Electric) sprayer can work over five hours on a standard nozzle (1.5 mm).
3m extension lance attaches to 7L 12L 16L and 20L sprayers. Great for really high areas!
This jazzy 2L sprayer is a little gem. Included inside the handle is a second smaller cone nozzle. You can also add a small extension lance as well for an extra $7