A donation from Phil Milazzo of Cambia System.
The Non-Linear Systems NLS TR-1B Tracer was manufactured in the late 1970s. It was used with 30 MHz portable oscilloscope powered by an AC charger or the internal rechargeable lead-acid batteries.
The dual Inputs will handle up to 450 volts. It came with a charger, and probes. The Tracer measures 6 1/4" x 2 5/8" x 8" deep.