I bought a $20 laser rangefinder.  My, it does it make things easier!

Laser UWB
17 0
75 53
70 67
137 119
198 170
282 260
358 341
428 412
489 474
548 520
607 587
664 641
751 756
821 802
888 907
968 978
1056 1036
1115 1180
1267 1248

The laser gets confused below about 50cms.  The UWB seems to under-read by about 25cms.

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