How many types of levelling staffs are there?

There are several types of leveling staffs, primarily categorized into two main types: graduated staffs and telescopic staffs. Graduated staffs are marked with measurement increments, typically in meters or feet, and are used for direct readings. Telescopic staffs can be extended or retracted for ease of transport and use, making them versatile in various surveying scenariOS. Additionally, there are specialized staffs, such as digital or laser staffs, designed for specific applications in advanced surveying techniques.