http://www.johnnyseeds.com/p-7873-four-row-pinpoint-seeder.aspxFour-Row Pinpoint Seeder
The tool of choice for greenhouse planting of small to medium-size seed.
Maneuvers with ease in enclosed spaces. Plants four rows 2 1/4" apart or, optionally, two rows 4 1/2" apart, or two rows 6 3/4" apart. Individually adjustable brushes in hoppers precisely meter seed. Designed to be pulled. Handle included. Comes standard with four seed-hole sizes for small to medium-size seed.
Couldnt find a video of the 4 row seeder. But Wranglerstar features it in a video he does about the CasaVerdeCSA.
Here is a video of the significantly more expensive 6 row seeder.