Using this General Radio Co. decade resistance box is quite straightforward. Just connect it to your electrical setup as needed for resistance testing. When handling it, be careful not to drop it as it's made of metal and wood which can get damaged. Since it's a used item, expect some scuffs. It hasn't been tested, so test it before relying on it for critical work. To maintain it, keep it in a dry place and clean it gently with a soft cloth every once in a while. This will help keep it in good working order for a long time.