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Old 10-26-2015, 12:21 AM   #11
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Originally Posted by hbillsmith View Post
It works something like this. You need to stand about 10 feet or so off to the side of your RV. Holding the unit steady (say pressed against your chest), you first press the Pyth symbol button, then for distance measure A point the laser to the highest point of your RV and press the Measure button. Then keep holding the unit in the same place and for Distance Measure B tilt it down to point the laser to a spot at the bottom of the RV and press Measure button.

The unit takes distance measure A, distance measure B and uses its internal sensors to register the angle created by the tilt. Those 3 measures (A,B,Tiltangle) are all it needs to calculate the RV Height and that is displayed as the answer.
I don't think that is right. Pyth is based on a right triangle, so you can't hold it say chest high and measure high then low. You need a 90 degree angle so I guess you could hold it at a known height, say 4 feet from the ground and measure parallel to the ground to your RV for your distance of A then holding it at the same point make the measurement to the top of your ac for the C measurement. C is what your measuring when you go high ( the hypotenuse) Once B (height) is calculated then add 4 feet to the solution, I guess.

I just wonder how accurate you can be. Have you actually done it and verified the measurement? It seems to me that you would have to lay the unit on the ground and measure the distance to the RV and then from the exact same point on the groun tilt it to aim high to catch just the top edge of the highest thing on your roof. I don't know, I would not trust it and end up climbing up there anyway. Oh, and you have to do this while it is connected to your TV...
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Old 10-26-2015, 12:28 AM   #12
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Originally Posted by dalford View Post
I don't think that is right. Pyth is based on a right triangle, so you can't hold it say chest high and measure high then low. You need a 90 degree angle so I guess you could hold it at a known height, say 4 feet from the ground and measure parallel to the ground to your RV for your distance of A then holding it at the same point make the measurement to the top of your ac for the C measurement. C is what your measuring when you go high ( the hypotenuse) Once B (height) is calculated then add 4 feet to the solution, I guess.

I just wonder how accurate you can be. Have you actually done it and verified the measurement? It seems to me that you would have to lay the unit on the ground and measure the distance to the RV and then from the exact same point on the groun tilt it to aim high to catch just the top edge of the highest thing on your roof. I don't know, I would not trust it and end up climbing up there anyway. Oh, and you have to do this while it is connected to your TV...
I have also done it the way you described in your last paragraph. I first did it in my living room where I first measured the ceiling height by setting the unit on the floor and pointing it at the ceiling. Then I compared that result to the one I got by having it tell me the height of an ajoining wall. They came out with a 100th inch the same. You are correct in that setting the unit on the ground is simplest, but I did get a good read doing the chest high method also.
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