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Those things are saviors to me. And to everybody, for that matter, since they are the ones who help us making 99,99% precise maps. I have worked with some and I really like 'em. But they're expensive as fuck.
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By the way the device on the photo is a high-precision one (1'' angular accuracy). I bought mine to measure old power transmission towers (which had no technical documents available for them, not even basic geometric measurmens) at work. Since then the device is unused, but I'd agree - it's a very good instrument.