Yes. There are numerous OIML Recommendations that cover the wide range of content in the scale-relevant sections of NIST Handbook 44. Please see a complete crosswalk list of topics here.
When selecting a scale for a particular application, several aspects need to be considered:
Scales used for commercial applications must comply with the laws of the state in which it will be used as a legal metrology device. Since all 50 US states have adopted NIST Handbook 44, the most important aspect is that the scale has an active NTEP Certificate of Conformance as proof that it is compliant with NIST Handbook 44. Note that NIST OWM does not recommend or endorse any particular scale types.
Before a scale can be used for commercial applications, it must be inspected and approved by an authorized body of the state it is used in. Click here for a listing of state and territory weights and measures offices and contact information.
Commercial applications are defined in NIST Handbook 44, section 1.10 General Code, G-A.1 as applications in which a weighing instrument is being used or employed:
The scale division, d, is the actual resolution of a scale (analog or digital). The verification scale division, e, is a measure for the accuracy of the scale and is used to define the scale classification and to determine the tolerances. Every scale (that falls under the Scale Code, section 2.20 of Handbook 44) has a verification scale division, e. But not every scale has an indication (e.g. a balance) and therefore not every scale has a scale division, d.
As the verification scale division, e, relates to the accuracy of the scale, all tolerances defined in the Scale Code, section 2.20 of Handbook 44, are expressed in e. Some requirements relate to the scale division, d, but those requirements do not define any tolerances.
For scales of accuracy classes III, IIIL and IIII, (used in most applications), the scale division, d, must be equal to the verification scale division, e (i.e. the resolution of the indication must be approximately the same as the accuracy of the scale). Only scales of class I and II may have a scale division, d, smaller than the verification scale division, e. But that does not mean that the scale is more accurate. To avoid a false sense of accuracy, the digit indicating the smaller scale division, d, must be clearly differentiated from the other digits.
Note: Item SCL-23.3 on the 2023 NCWM S&T agenda aims to correct inconsistencies regarding the use of the terms “scale division” and “verification scale division” in Handbook 44.
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