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Overview NIST Handbook 44 sections and OIML 

Recommendations for weighing instruments

Instrument type NIST Handbook 44 section/Title OIML Recommendation/Title Remarks

Retail scale, laboratory 

scale 

2.20 Scales R 76 Non-automatic weighing 

instruments

Static weighing vehicle 

scale

2.20 Scales R 76 Non-automatic weighing 

instruments

Weigh-in-motion vehicle 

scale for commercial 

application

2.20 Scales R 134 Automatic instruments for 

weighing road vehicles in motion 

and measuring axle loads

Weigh-in-motion vehicle 

scale for law enforcement 

application

2.25 Weigh-In-Motion Systems 

Used for Vehicle 

Enforcement Screening

R 134 Automatic instruments for 

weighing road vehicles in motion 

and measuring axle loads

section 2.25 is tentative and for 

vehicle screening purposes only

Coupled- and uncoupledin-motion railroad 

weighing system

2.20 Scales R 106 Automatic rail-weighbridges

Livestock scale 2.20 Scales R 76 Non-automatic weighing 

instruments

Dynamic monorail scale 2.20 Scales R 51 Automatic catchweighing 

instruments

Forklift scale and front-end 

loader

2.20 Scales R 51 Automatic catchweighing 

instruments

No live weight indication

R 76 Non-automatic weighing 

instruments

Live weight indication
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Instrument type NIST Handbook 44 section/Title OIML Recommendation/Title Remarks

Belt conveyor scale and 

weigh-belt system for 

weighing bulk material

2.21 Belt-Conveyor Scale 

Systems

R 50 Continuous totalizing automatic 

weighing instruments (belt 

weighers).

Automatic multi draft 

hopper scale

2.22 Automatic Bulk Weighing 

Systems

R 107 Discontinuous totalizing 

automatic weighing instruments 

(totalizing hopper weighers)

Batching scales do not fall under 

Handbook 44, section 2.22

Batching system A batching systems is not regarded as a single weighing instrument.

Each individual scale of a batching system is considered a separate weighing instrument and is subject to the 

applicable NIST HB 44 section and OIML recommendation.

Non-automatic single draft 

hopper scale

2.20 Scales R 76 Non-automatic weighing 

instruments

Weigh labeler 2.24 Automatic Weighing 

Systems

R 51 Automatic catchweighing 

instruments

Category Y in OIML R 51

Automatic checkweigher 2.24 Automatic Weighing 

Systems

R 51 Automatic catchweighing 

instruments

Category X in OIML R 51

Automatic gravimetric 

filling instrument

2.24 Automatic Weighing 

Systems

R 61 Automatic gravimetric filling 

instruments

Load cells 2.20 Scales R 60 Metrological regulation for load 

cells

Weights as part of/in 

combination with a 

weighing instrument

2.23 Weights R 111 Weights of classes E1, E2, F1, F2, 

M1, M1–2, M2, M2–3 and M3

Class M1, M1–2, M2, M2–3 and M3 in 

OIML R 111 for use with a class III 

weighing instrument

Arched chute weighers Not covered by NIST HB 44 R 150 Continuous totalizing automatic 

weighing instruments of the 

arched chute type
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Overview other NIST standards and OIML 

Recommendations for weighing applications

Application NIST standard OIML Recommendation/Title Remarks

Test weights Handbook 105-1, Specifications and 

Tolerances for Field Standard Weights

R 111 Weights of classes E1, E2, F1, F2, 

M1, M1–2, M2, M2–3 and M3

Net contents Handbook 133, Checking the Net 

Contents of Packaged Goods

R 87 Quantity of product in prepackages