Battery
The bigger battery you have, the more power you will receive. If you have a mains multi-tool, battery power will not be an issue as you will receive contact power from the plug socket.
If you already use a certain brand of tool, it may be a good idea to buy the same branded multi-tool if you’re looking for a cordless, as the batteries will be compatible.
Features
When it comes to features and accessories, there are lots to choose from. Blades will cut into all kinds of materials such as wood, copper, and more. There are also varieties of rasping pads, scrapers, and sanding pads.
Speed
Multi-tool speed is measured in oscillation, which is how quickly the blade moves from side to side. You can purchase a variable speed multi-tool that allows you to change the speed depending on the job you’re completing.
It is important to get the speed correct when cutting as a low cutting speed will not cut, while a stroke that is too high may become too hot and scorch.
Power
When it comes to power, you have two options, cordless or mains. A cordless type is great in getting to those hard to reach areas but will not offer as much power as you would get from a mains version.
A cordless multi-tool usually comes with either a 12v or 18v battery, whereas a mains version will give much more constant power but will obviously not be as portable.