IT-5283 Signal Tracer The Heathkit IT-5283 Signal Tracer is a compact, service oriented instrument that incorporates many features. SPECIFICATIONS Functions . . . . . . . . . . . . . . . Speaker substitution Speaker . . . . . . . . . . . . . . . . 3” permanent magnet 16 ? Power Supply . . . . . . . . . . . . . . Two 9-volt batteries and/or IPA-5280-1 Power Supply Dimensions . . . . . . . . . . . . . . . 5-3/4” high, 11” wide, 7-3/4” deep Net Weight . . . . . . . . . . . . . . . 3 lbs.