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2. Hand-held instruments
So-called "hand-held" instruments are used for various length measurements directly by hand, i.e. without a support or length reference, as in the case of comparative measurements with a marble. Good practice dictates that these instruments should be used with a light, relaxed hand, since, particularly with slide instruments, the measuring effort exerted by the operator can have a significant influence. This influence is significantly reduced with micrometer screw instruments fitted with a torque-limiting device, which allows zeroing on the standard and measurement with the same effort.
2.1 Slide instruments
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Hand-held instruments
Vertical Meters
References
Standardization
Association française de normalisation AFNOR
- Spécification géométrique des produits (GPS). Comparateurs à levier mécaniques. Spécifications. Méthodes d'essais. - XP E 11-053 - Déc. 2000
- Instruments de mesurage de longueur. Comparateurs mécaniques à cadran, à tige rentrante radiale. Spécifications. Méthodes d'essais. - NF E 11-050 - Déc. 1990
- Spécification géométrique des produits (GPS). Comparateurs...
Manufacturers
Vernier calipers, sliding depth gauges :
Roch Lunéville France, Brown and Sharpe Group
TESA (Switzerland), Brown and Sharpe Group
Etalon (Switzerland), Brown and Sharpe Group
Sylvac (Switzerland): digital calipers
Mahr (Germany)
...
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