With the mobile office an essential part of a contractor’s life, Ridgid’s new Power Inverter makes a lot of sense. This one-stop clean-power source stores in the glove box and provides up to 100 watts to items like laptops, tablets, cellphones, and battery chargers. It connects to the power port in a car, van, or truck and brings juice to a standard 120-volt outlet and two USB ports. Price: $25. ridgid.com.