The Kadee three - point track gauge is a great tool for HO scale model railways. It's die - cast and comes with a centerline indicator. One side is for Code 83 rails, and the other side is for Code 100 rails, making it very versatile.

Using this Kadee track gauge is easy. First, decide which side to use based on whether you're working with Code 83 or Code 100 rails. Place the gauge on the track and check if the rails fit properly within the gauge's measurement points. The centerline indicator can help you ensure that the track is centered correctly. When handling the gauge, be gentle to avoid any damage to the die - cast material. After use, clean it with a soft, dry cloth to keep it in good condition. Store it in a dry place to prevent rusting.