Birdwatch Note Rating
2025-01-31 15:24:24 UTC - NOT_HELPFUL
Rated by Participant: 3E0896BB802C706AE0B58B426CD98E1015C76CB4F25981DE922A0CF7783409F8
Participant Details
Original Note:
The device shown is a LEVEL, it shows if the surface it is placed on is even side-to-side to the local gravity field. To determine if a surface is FLAT, one should use a Kemet Flatness Gauge* or an interferometer or autocollimator.** * https://www.kemet.co.uk/products/flatlapping/flatness-gauges ** https://www.mitutoyo.com/webfoo/wp-content/uploads/15004A.pdf
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