The application of stimulus current can be controlled by an electronic timer from 0.1 sec. to 1 sec. in steps of 0.1 & the 11th step is of 3 secs. The instrument provides 50 Hz stimulus current which can be adjusted from 0.15 mA to 330 mA in discrete steps for producing minimal and supra maximal Seizures required in the assaying of anti-epileptic and anti-convulsant drugs. An L.E.D indicates the duration of stimulus.