A range-finder is a device used to measure the distance between two objects. It is also known as a telemeter, which is a nine-letter word that can be found in crosswords. Range-finders are used in many different fields, such as surveying, navigation, and photography. They work by measuring the time it takes for a signal to travel from one object to another and back again. Range-finders are essential tools for accurately measuring distances and can be used in a variety of applications.