My $140 signal tester saved me from a 3-hour troubleshooting nightmare

Honestly I kept putting off buying one of those proper signal meters, figured my multimeter was enough. Then last week I had a door sensor that kept dropping off the panel, weak signal from a metal door frame in an older house. Spent $140 on a basic tester, found the issue in 5 minutes, it was a bad resistor on the zone expander, not the wiring. Has anyone else found their cheap tools actually made jobs take way longer than just coughing up for the right gear?

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