A transmitter that's 1 in. (25.4 mm) in diameter and less than 5 in. (106.4 mm) long can be used in smaller pipes to locate and remove stuck pigs (pipeline inspection gauges). The SPY PT-101's tiny frame uses a receiver and wand, which enables a free air space pick-up range of 15 to 20 ft. and temperatures from -20° F to 180° F.
Pipeline Inspection Co. Ltd.