Posted: Sun Feb 11, 2018 1:58 pm
by dbhguru

Part of my monthly routine is to perform tests on the calibration of my equipment and to put our tree measuring processes through their paces. I frequently tout the accuracy of the reticle-based monocular. So while it was raining outside, I set up a simple test in my basement. The target was a yardstick with each foot marked off. Measuring the middle foot was the objective. Distances to the ends of the 1-foot section were 21.120 and 21.172 feet as measured with a Bosch GLM80. The reticle reading was 48. This yielded a calculated target width of 1.0160 feet. The 0.016 feet equals 0.192 inches (approximately a fifth of an inch). I'll gladly take these results.