When you're looking for a rangefinder, it's important to have an idea of a few of the fundamentals of laser rangefinders from the beginning. Before we had laser rangefinders, we had much inferior optical rangefinders whose accuracy varied with the distance and which often gave inconsistent readings from one user to the next. They were also large and cumbersome for field work and rather slow to operate. As to accuracy, they were crude by today's standards, though certainly better than a guess. Because of these shortcomings, most folks tended to go without a rangefinder when they headed to the hunting field or golf course.
Laser rangefinders have changed all that. Even the lowest priced laser rangefinder is capable of far better performance and accuracy than any optical rangefinder and all in a unit that can fit in your pocket in many cases. So how do they do it? What makes laser rangefinders work? What are the basics of a laser rangefinder?
Despite all the technology that goes into a laser rangefinder, they are rather simple in concept. They are, in fact, very much related to auto focus cameras which used the same technology prior to the widespread use of laser rangefinders.