(Latest with digital counter) - For determining neuro-pixicity, muscle tone, balance and motor co-ordination in rats and mice. Consisting of two or three or four compartments of 75mm width each with a rotating rod of 25mm diameter having speeds of 5,10,15,20 and 25 r.p.m. with time interval counters in each compartments. a) Two compartment. b) Three compartment. c) Four compartment.