Measures cloud heights up to 3,000 feet. The projector features a large reflector and 100 watt, 6 volt sealed beam lamp. Life of 50 hours (approx.). Includes a 3-minute time limit switch, which is connected to the lamp power supply and prevents longer periods of operation. The lamp operates on 120 VAC, 50/60 Hz. Used to determine the elevation angle of the light spot projected on the cloud base. Size: 9″ diameter x 13″ height (229M x 330M).Weight: 18 lbs. (8 kg). Shipping: 25 lbs, (11.3 kg).