The allowed usages of Distance Measuring Devices (DMDs) are identified under Rule 4.3a(1), (2) and (3). More detailed information and examples can be found on either the R&A’s or USGA’s websites.

7.1 How to Fairly Search for Ball 7.1a/1 – Examples of Actions Unlikely to Be Part of a Fair Search Examples of actions that are unlikely to be considered reasonable as part of a fair search, and will ...

For certain high-security devices, such as card readers, ATMs, and hardware security modules, normal physical security isn’t ...