When HN users recommended it
1 HN user recommended this in 2017, in one comment.
20072026
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
1 HN user recommended this in 2017, in one comment.
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
Multi-frequency phase interference can be used to get sub-cm accuracy without needing ridiculous oscillators. The only problem is that you need to sample your target several times with different frequencies to remove the ambiguity.
Units like this:
https://www.amazon.com/Bosch-GLM-35-Measure-120-Feet/dp/B00V...
that go for $75 (or less) do this. They're super accurate, the only downside is that it takes a second to cycle through all the necessary frequencies.