For the uninformed, one british foot in length (or 304.8mm to be precise) is about 1ns in time.

Proof:
c = 2.99792458 x 10 8 m/s (http://www.what-is-the-speed-of-light.com/)

1ft = 304.8mm := 3.048 x 10^-1m

Therefore:
1ft = 3.048 x 10^-3 m / 2.99792458 x 10^8 m/s == 1.01670336216396744710 x 10^-9 s

So this jackass is selling remarked wooden school rulers for the super deal price of $1.50 + s&h.

Novelty toys for the physicsts.