Final answer:
The most appropriate tools to find the distance between New York and Pennsylvania are a map or a GPS, depending on the presence of a scale for measurement on the map.
Step-by-step explanation:
The best tool to find the distance between New York and Pennsylvania would be either a map or a GPS. A ruler can be used alongside a map if the map has a scale, allowing for the conversion of map distance to real-world distance in units like inches, centimeters, or millimeters. However, for precise measurement without manual conversion, a GPS would be able to provide the distance directly, typically in miles or kilometers.