Review on 🛠️ Miady Trailer Wiring Tester: Heavy Duty 7 Pin RV Blade Connector Circuit Tester with LED Indicator - Ensure Proper Trailer Hitch Wiring by Andres Imaging

No documents, guides or manuals included. The indicators on the dial don't match the pins on the connector, so it's quite difficult to tell which indicator corresponds to which pin on the connector. .If you're a mechanic who uses these devices every day, you might know what they tell you when you plug them in. But for those trying to troubleshoot why their trailer brakes aren't working properly, it's just useless! Even the labels identifying each indicator on the device are confusing. I understand: RT, LT, BU, BK, but what does TM mean?