Using this Klein Tools 69031 fuse is easy. First, make sure your MM300 multimeter is turned off. Then, carefully replace the old fuse with this new one. It's a good idea to keep it as a spare, so if your current fuse blows, you can quickly swap it out. When handling the fuse, be gentle as it's made of ceramic and can break easily. To maintain its performance, store it in a dry and cool place. Avoid exposing it to moisture or extreme temperatures. If you have an additional Cat. No. 69032 fuse, you can use them together for better protection.