The TGP110 is a mains operated, 0·1Hz to 10MHz pulse generator with independent variable 50Ω Main and CMOS/TTL Auxilliary outputs. Period, pulse width and delay are each selected by an 8 position range switch, plus a vernier control. There are no duty cycle limitations and with the use of the Complement switch very stable pulse trains with duty cycles of ~0 to ~100% can be achieved, within the overall period and pulse width limitations. Error lamps indicate illegal settings of the pulse width and pulse delay controls. The variable 50Ω output is controlled by a vernier over two switch-selectable ranges of 0·1V to 1·0V and 1V to 10V (from 50Ω), giving an overall range of 50mV to 5V into a 50Ω load. Operating modes are run, external trigger, external gate, and manual one-shot or gate. The pulse modes are normal, square, double and delayed. The Complement button inverts both the Main and Auxilliary outputs. A Sync output and a Trigger/Gate input are also provided.