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I often refer to the importance of having plenty of tools in the toolbox. Most of the time, that toolbox is metaphorical, referring to one's abilities to be versatile and adaptable. But other times, I'm being quite literal. And one device that should always sit at the centre of that toolbox (the real, not the metaphorical one) is a digital multimeter.
The common denominator among a random sampling of custom channel installers will always be a love of tools. More than one installer's heart skips a beat when the new Princess Auto catalogue arrives in the office mail. As the critical link between an installer's skills and a finished project, the tools that are selected are is important as how they are used.
Custom channel installers aren't going to be installing high voltage wiring on the jobsite unless they are licensed electricians. But the fact is that the work puts them in contact with high voltage lines and equipment. The electrical current in a residential or commercial jobsite is, frankly, enough to kill you. Even low voltage equipment like LED lighting can deliver a nasty shock if it's treated carelessly. Consequently, it's of paramount importance for installers to be aware of how to work safely around high voltage.
Testing and validating all the lines in a project is a necessary step at several phases of a custom channel installation; from after they're run to troubleshooting (if necessary) later on. Reliable testers are a critical tool for installers.