Filter type; 9.85 inch L x 1.27 inch W x 1.38 inch D Size; Tone generator used on; ABS plastic housing material; (1) 9 V power supply type; 35 dB gain; 100 Mega Ohm input impedance; 300 Ohm tip resistance; battery life 50 hr
Greenlee's multi filter tone probe is especially well suited for 577Hz Telco tone sources and a version is available for 1kHz systems.