Here is the text of an email from Steve Colburn, Director of Sales for North America for LTI, sent to a number of Ents and affiliates.
Hello Bob, et.al.!
Thanks as always for putting our instruments to the test, Bob. There is nothing like an impartial keen eye to keep us on our toes! My delayed response to this message is due to the fact that I wanted to verify something with our (very busy) Engineering dept. It was to determine the formula used to round the numbers seen in the display of the TruPulse, after a precision distance measurement is completed. Here is the answer:
When units are set to Feet with the increments at 0.5', the unit rounds as follows:
10 = 9.75 to 10.24
10.5 = 10.25 to 10.74
11 = 10.75 to 11.24
When you confirmed with me, Bob, that you positioned yourself right at the changeover point with the higher number displayed, this would put you at the low side of the value, ~ 0.25' less than the display. If you factor this in to the data set attached, the numbers get even better with an average error of ~ 0.08' or about an inch!
This demonstrates that careful use of the instrument with proper procedure can yield very accurate results. We need to keep in mind, however, that most users won't practice quite the level of care as Bob does when measuring and they also will be shooting to more "uncertain" targets like leaves, twigs, candles, etc. At any rate, it sure is nice to see confirmation in the data that the process is working as planned!
Many thanks also for organizing the workshop at MTSF last Friday Bob, you did a great job as usual. Walks through the woods measuring trees with you is quickly becoming one of my favorite activities!
Director of Sales, North America
Laser Technology, Inc.
By taking the time, it is apparent that we can measure distances extremely accurately with the TruPulse line. From a spot of know distance, the angle can be measured independently to get our best determinations of height to date. Note that Steve says
This demonstrates that careful use of the instrument with proper procedure can yield very accurate results.
By proper procedure, Steve means the sine method where that method needs to be used. He has to be cautious about what he says for obvious reasons, but he understands what works and what doesn't. We are making rapid strides in getting the message across.