Tree calipers, also known as height calipers or depth calipers, are measuring tools used to measure height or depth distances. They are usually designed as hand tools and consist of a linear caliper and a measuring tip. Tree calipers can be mounted in a variety of ways, depending on the application and environment. Some models have a flat base to stand on a flat surface, while others can be mounted to a stand or bracket. This allows for precise measurements in hard-to-reach places. Surface mounted calipers can come in a variety of styles and sizes, and may be equipped with a digital or analog movement. Some models have a locking screw to hold the measuring tip in place, while others have a ratcheting feature to ensure consistent and accurate measurement. Surface mounted calipers are widely used in metalworking, engineering and workshop applications.