Labour saving?

Went to Lidl today for the first time, and found an excellent labour saving device, for £2.95.
It is a seed sowing implement, consisting of 2 small bowls/cups, attached to a hand grip. One of the bowls is closed, and the other has a funnel shaped bottom with a long aluminium tube, and it weighs next to nothing in your hand.
What you do, is fill the closed bowl with the seed you want to sow, place the tip of the tube on the gound where you want the seed to go, and then just flick a few seeds into the funnel bowl. Move the tube along and repeat. It's such a simple idea, why haven't I seen anything like it before? Probably will save a lot of bending when sowing, and hopefully a lot of thinning out with things like carrots and lettuce etc..
The tube is even big enough to allow the passage of seeds as big as peas, but not runner beans, although french beans may pass through it. I'll have to let you know on that one.