Frequency and intensity dial

The frequency and intensity dials were a part of the Fourteenth Doctor's sonic screwdriver located below the resonator cage. This section of the screwdriver resembled parts of the Master's laser screwdriver. (PROSE: )

Behind the scenes

 * As revealed by props makers Michael van Kesteren and Barry Jones, the frequency and intensity dials portion of the sonic contained a ball detent ratchet — as Phil Sims wanted "knurled" detail on the sonic — so the dials, when turned, made a clicking noise.