UL 1439-2021 pdf download.Tests for Sharpness of Edges on Equipment. 6 Calibration of Tester 6.1 The sharp edge tester is to be calibrated so that a 1-1/2 ±0.03 lbf (6.672 ±0.133 N) is present at
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UL 1439-2021 pdf download.Tests for Sharpness of Edges on Equipment. 6 Calibration of Tester 6.1 The sharp edge tester is to be calibrated so that a 1-1/2 ±0.03 lbf (6.672 ±0.133 N) is present at
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