With the growing popularity of ukes I'm fitting or supplying lots of K&Ks. Ukes are braced in a number of different ways - ladder, modified X, fan, or sometimes not at all. So it's a good idea to check yours out before ordering. A bit of experimentation can be necessary to find the best location for transducers, but the K&Ks are pretty tolerant and always seem to deliver an accurate sound. The most popular models are listed below, together with some other options which are more suited to larger instruments.
K&K's high-gain transducers mean that pre-amps are not essential, though can be a good idea on a larger stage or to ensure the best matching with your amp or mixer.
I am also happy to fit your pickups if you prefer to acquire them directly.