Most people have never held an Amprobe AT-7000-EUR, and even fewer would guess a cable tracer can cost about $2,700. Electricians use this kit when a cable disappears into drywall, a ceiling, a floor, or a crowded panel and a cheap tone probe is not enough. One half of the kit is a transmitter you clip onto a circuit. That box injects a tracing signal, 6.25 kHz on live wires or 32.768 kHz on dead ones, in high, low, or clamp mode. The other half is a receiver with a color screen, a tip sensor, and a Smart Sensor array that shows where the wire runs and which way it is going, often to about two inches, and can pick the correct breaker instead of a handful of false hits.

Techmoan already owned an 18-inch Hughes Wave Motion Machine that set him back about $500. He wanted something longer, so he paid $300 for the biggest model waveshop listed, a 25-inch unit shipped from India.