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When converting a standard 120-volt outlet to a 240-volt outlet, the only components you can typically reuse are the existing electrical box and the hole in the wall. Everything else—including the wiring, breaker, and receptacle—should be replaced to ensure both safety and efficiency. Appliances designed for 240 volts have different plug configurations that won’t fit into a standard 120-volt outlet, making it necessary to install a compatible 240-volt receptacle. This design helps prevent overloading or underloading the power available to any one outlet or circuit.

Ultimately, the best device depends on what you’re measuring. A voltmeter only measures volts, while a multimeter measures volts, current, resistance, humidity, and possibly much more, depending on the model. If you think you’ll need to measure more than volts, consider investing in a multimeter so you have a tool that can help you with various household projects.

Services by electricians can quickly get expensive, but there are a few ways you can save money in the process:

• Bundle multiple jobs done at the same time to save on trip fees or flat fees for individual projects.

• Get at least three quotes for service to find the best deal.

• Buy fixtures, switches, outlets, and other materials beforehand to avoid product markup.

• If you feel comfortable with it, have an apprentice or journeyman complete the work under the supervision of a master electrician. These electricians in training tend to charge less per project.

Outlets with only two slots have no ground connection. That’s more common on very old outlets, which means it’s more likely the outlet won’t be polarized. You’ll have to closely examine the slots to see if there’s a size difference indicating polarization. Keep in mind outlets this old are usually out of code and should be replaced if you’re doing any electrical work.