Universal Digital Counter

Universal digital demonstration counter for measuring time, frequency and pulse rates, with a six-digit 7-segment LED display. It provides four time-measurement ranges from 10¹ to 10⁴ s and four automatic frequency ranges from 10¹ to 10⁴ kHz, with audible signal monitoring. For pulse-rate measurements, it accepts a Geiger–Müller tube and provides adjustable anode voltage from 325 to 600 V in 12 steps. Housed in ABS plastic with recessed handles; dimensions 260 × 150 × 210 mm; power supply 230 V/50–60 Hz.