How do I measure the height of a place?

I need an app or some “software” in which I can measure the height of a certain object. I gotta measure the height of a place. Or, some strategy. I wanna know exactly the height. I needa know that by Friday night. By my calculations, it must be aboot 70 meters high where I measured it. But maybe, I’ve measured it... show more I need an app or some “software” in which I can measure the height of a certain object. I gotta measure the height of a place. Or, some strategy. I wanna know exactly the height. I needa know that by Friday night. By my calculations, it must be aboot 70 meters high where I measured it. But maybe, I’ve measured it wrong. I need some tips and suggestions.
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