New from the “why didn’t anyone think of this before?” department: Genelec’s Acoustitape is a tape measure that marks feet/inches and metric measurements on one side and wavelengths from 10kHz to 115Hz on the other (including quarter wavelengths, which represent the predicted cancellation dip when a speaker is placed at a specified distance from the front wall in a studio). Besides its use for studio analytics, it’s perfect for discussions about acoustics with students. Available for €10 (about $13) at genelec.com.