If there is a single tool that is legitimately important for every Heating plus A/C specialist to own it is a multimeter, and a multimeter is a special tool that fits in the palm of your hand.
A multimeter usually has a numerical display and a graph to measure all of the values; Digital multimeters are low-cost and they can be obtained at any hardware store.
A multimeter can measure voltage, current, and also resistance. I obtained a up-to-date multimeter a couple of weeks ago and I used the device every single day on the task, then last week, I was working on an Heating plus A/C installation task and I was using the multimeter. I turned it on although I did not get any power at all. I hit the side of the machine, however it still didn’t power on. I put a couple of up-to-date batteries in the back of the digital device however that did not labor either. I use that tool every day for weeks and weeks and I could not believe that it hastily stopped working without a single problem. I had to go to the shop and borrow another tool so I could finish the Heating plus A/C installation task. It took an minute to drive back to the shop and then back to the residence. I spent more than seven minutes working on that Heating plus A/C installation task and I didn’t have our favorite tool to get everything done. I took the multimeter back to the hardware store as soon as our labor day was done. The guy exchanged the device without asking a lot of questions, so it might have been a manufacturer defect.