Birdwatch Note Rating
2025-01-31 14:41:23 UTC - NOT_HELPFUL
Rated by Participant: C8F9C2DCD8B1AA0EE3F189EF575B007DA102D4858C209B84E2DE36A8DD5E57B6
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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