RIDGID 49338 ST-33Q Transmitter. The RIDGID ST Line Transmitter Series are top-of-the-line transmitters designed for inducing current onto a target line for tracing. These Transmitters are lightweight and compact, they can transmit simultaneously and feature audio feedback for confirmation of a good circuit. The RIDGID 49338 ST-33Q Transmitter features a comfortable hand grip, lightweight design, and reliable performance. This RIDGID 49338 ST-33Q Transmitter is fully covered under RIDGID's 3-year limited performance warranty and lifetime warranty to be free of material defects.