Resolving time 5 sec for pulse pairs, count capaci type 99, 999 counr on five all-electronic dekatron tubes, input sensitivi type 0 25v negative, preset time intervals range 0.1 min. To infinity, preset count intervals 60 min. To infinity, input impedance 500, 000 ohms, geiger and signal, control: power on-off; high voltage on; high voltage on-off; preset time; preset count; discriminator; high voltage adjust; start; stop; reset, input power 115v ac, 60 cycles, at 1.2 amps, dimensions 19 inch w x 8-3/4inches h x 17 inches d, remo te control