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