ISO/IEC 17025 Accredited Mass Calibration
Accurate mass measurement supports nearly every industry—from pharmaceuticals and food production to logistics, chemical processing, and precision manufacturing. Our national network of local calibration providers delivers the precision your operations rely on, helping prevent errors, protect product quality, and reduce costly discrepancies.
Our Mass Calibration Services
Weighing instruments play a critical role in dosing, formulation, shipping, inventory management, and regulatory compliance.
When they drift out of specification, the impact can be extensive—incorrect batches, inventory errors, rejected shipments, compliance issues, and significant financial losses. The Accredited Labs network offers complete mass calibration services that keep your equipment performing within its required accuracy ranges.
Our Process
Mass calibration involves verifying and adjusting weighing instruments across their full operating ranges using certified reference mass standards with known, traceable values. Each device is evaluated to identify any deviations from its intended performance.
Skilled technicians test instruments using certified weights throughout their weighing capacities, document all variations, and make the adjustments needed to restore accuracy. If an instrument cannot be restored to the required accuracy range, you receive detailed reporting with the data necessary for corrective action, maintenance planning, or replacement decisions.
All mass calibrations follow internationally recognized protocols, including NIST Handbook 44 and relevant international weighing standards. Each instrument is returned with documentation linking its accuracy to national mass standards—supporting regulatory compliance, quality management systems, and commercial weighing requirements.
Types of Weighing Instruments We Calibrate
Our comprehensive mass calibration services cover the complete spectrum of weighing technologies used across industries:
- Analytical and Precision Balances: High-precision laboratory instruments used for pharmaceutical compounding, chemical analysis, and quality control applications. These instruments require specialized calibration procedures and controlled environments to achieve their specified accuracy levels.
- Industrial Platform Scales: Heavy-duty weighing systems used in manufacturing, warehousing, and shipping applications. Calibration ensures accurate weighing of products, materials, and packages across various industrial environments and loading conditions.
- Truck and Vehicle Scales: Large-capacity weighing systems used for commercial vehicle weighing, shipping verification, and regulatory compliance. These systems require specialized calibration procedures and certified test weights to ensure accuracy across their full capacity range.
- Bench and Counting Scales: Mid-range weighing instruments used for parts counting, quality control, and general weighing applications. Calibration ensures accurate weighing and counting functions across various industrial and commercial applications.
- Crane and Hanging Scales: Suspended weighing systems used in material handling, construction, and industrial lifting applications. These instruments require calibration under various loading conditions and environmental factors that affect their accuracy.
- Floor and Pallet Scales: Low-profile weighing systems designed for warehouse and industrial applications where materials are weighed on pallets or in containers. Calibration ensures accurate weighing of various load types and distributions.
- Checkweighers and In-Motion Scales: Dynamic weighing systems that weigh products while in motion on production lines or conveyor systems. These instruments require specialized calibration procedures that account for dynamic effects and speed variations.
- Retail and Commercial Scales: Point-of-sale weighing systems used in retail, grocery, and commercial applications. Calibration ensures compliance with commercial weighing regulations and fair trade practices.
- Shipping and Postal Scales: Weighing systems used for package weighing, shipping cost calculation, and logistics applications. Accurate calibration prevents shipping cost errors and ensures compliance with carrier requirements.
- Specialty and Custom Weighing Systems: Application-specific weighing solutions including tank scales, hopper scales, belt scales, and integrated weighing systems. These require customized calibration approaches based on their specific design and application requirements.
Find Mass Calibration Services
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Accutek Lab
Accutek Lab has been providing reliable and cost-effective pipette calibration services across the United States since 1996.
Calibration ServicesPipette Calibration -
Aldinger
Since 1972, Aldinger has been providing top-quality calibration services for test and measurement equipment in Texas and beyond.
Calibration ServicesDimensional Calibration Electrical Calibration Flow Calibration Force Calibration Mass Calibration +7 more -
Cal-Cert
Cal-Cert is committed to providing the highest level of calibrations and certification service to our customers.
Calibration ServicesForce Calibration Torque Calibration Mass Calibration Pressure Calibration Temperature Calibration +3 more -
Cal-Labs
Cal-Labs has provided quality calibration in Southern California since 1977. We are A2LA accredited to ISO 17025.
Calibration ServicesDimensional Calibration -
Calibration Services Inc.
Calibration Services, Inc. (CSI) is an on-site and in-house calibration firm specializing in calibration and service of mechanical testing devices.
Calibration ServicesForce Calibration Torque Calibration Mass Calibration Dimensional Calibration Pressure Calibration +3 more -
Cal Tec Process Management
The calibration specialists at CTPM have been providing precision calibration and quality assurance since 1987.
Calibration ServicesForce Calibration Torque Calibration Mass Calibration Dimensional Calibration Pressure Calibration +2 more -
Calser Calibrations
Since 1979, Calser Calibrations has delivered trusted, precision calibration services backed by a commitment to quality and reliability.
Calibration ServicesConstruction Materials Testing Equipment Calibration Dimensional Calibration Force Calibration Mass Calibration Pressure Calibration +3 more -
CMG Sales, Inc.
CMG Sales, Inc. is a leading manufacturer sales representative and ISO 17025 accredited calibration laboratory providing services to manufacturers nationwide.
Calibration ServicesCoating Thickness Calibration Color Calibration -
Color Calibration Group
Color Calibration Group has been providing professional calibration services for all your color, light, and viscosity calibration needs for over 25 years.
Calibration ServicesCoating Thickness Calibration Color Calibration -
ETI Precision
ETI has been a leader in the calibration, repair, and sale of test and measurement equipment since 1994, and covers all 50 states.
Calibration ServicesElectrical Calibration Force Calibration Torque Calibration Dimensional Calibration Pressure Calibration +2 more -
Holts Precision, Inc.
For over 60 years Holts Precision, Inc. has performed calibrations & repairs on all major brands of gaging equipment.
Calibration ServicesDimensional Calibration Electrical Calibration Force Calibration Mass Calibration Pressure Calibration +2 more -
Huston-DePue
Established in 1960, HDCL is staffed by experienced professionals who understand the critical role accurate measurement plays in quality control and regulatory compliance.
Calibration ServicesFlow Calibration Force Calibration Torque Calibration Mass Calibration Dimensional Calibration +3 more -
Instrument Technologies, Inc.
For over three decades, Instrument Technologies, Inc. (ITI) has been a trusted partner for regulated industries seeking precision, compliance, and operational reliability.
Calibration ServicesFlow Calibration Mass Calibration Dimensional Calibration Pressure Calibration Time Calibration +1 more -
IPM, Inc.
Industrial Process Measurement, Inc. has been in the instrument supply, service and calibration business for over 30 years.
Calibration ServicesDimensional Calibration Electrical Calibration Flow Calibration Force Calibration Humidity Calibration +6 more -
J & J Calibration Service
J&J Calibration Service, an ISO-17025 accredited company, offers unmatched mobile calibration capabilities and laboratory calibration services.
Calibration ServicesDimensional Calibration Electrical Calibration Force Calibration Pressure Calibration Temperature Calibration +1 more -
OCS Technologies
Founded in 1930, OCS Technologies is a trusted multi-discipline calibration service provider as well as leading product distributor.
Calibration ServicesForce Calibration Torque Calibration Mass Calibration Dimensional Calibration Pressure Calibration +3 more -
OnCal
With over 23 years of experience in pipette calibration in the Pacific Northwest, the OnCal Corporation guarantees seamless and dependable metrology services.
Calibration ServicesPipette Calibration -
Polymer Testing Instruments
Since 1996 Polymer Testing Instruments Inc. has provided high quality service and calibration of equipment for the rubber, plastics, and energy industries.
Calibration ServicesForce Calibration Torque Calibration Dimensional Calibration Pressure Calibration Temperature Calibration +1 more -
Precision Calibration Systems
PCS is a full-service ISO 17025 Accredited calibration laboratory, founded with the goal of providing reliable and accurate instrument calibration service.
Calibration ServicesFlow Calibration Force Calibration Torque Calibration Mass Calibration Dimensional Calibration +4 more -
Quality Control Services
Quality Control Services is an established, accredited calibration services and laboratory equipment company with over 40 years of experience.
Calibration ServicesForce Calibration Mass Calibration Pipette Calibration Temperature Calibration -
Quality Surveillance, Inc.
QSI has been providing Los Angeles, Ventura, Santa Barbara and Santa Clarita Counties with reliable and cost effective metrology services since 1992.
Calibration ServicesDimensional Calibration Force Calibration Mass Calibration Pressure Calibration Temperature Calibration +3 more -
Scale Service & Supply
From laboratory balances to truck scales, Scale Service & Supply has been providing precision calibration for weighing systems since 1987.
Calibration ServicesScale Calibration Mass Calibration -
Servo Innovations
Servo Innovations, founded in 2005, has earned industry-wide trust for its accredited calibration, repair, and technical services.
Calibration ServicesFlow Calibration Force Calibration Torque Calibration Dimensional Calibration Pressure Calibration +1 more -
Tescom Calibration Services
Tescom Calibration Services has provided sales, repair, and calibration of telecom test equipment since 1982.
Calibration ServicesFlow Calibration Force Calibration Torque Calibration Mass Calibration Dimensional Calibration +4 more -
Trident Calibration Labs
Serving the greater Phoenix area, Trident Calibration Labs has more than 100 years of combined calibration experience.
Calibration ServicesElectrical Calibration RF & Microwave Calibration Dimensional Calibration Force Calibration Mass Calibration +6 more -
Tru Cal International
Serving as an asset to countless businesses in a variety of industries, Tru Cal International has specialized in test equipment calibration since 1992.
Calibration ServicesElectrical Calibration Dimensional Calibration Force Calibration Pressure Calibration RF & Microwave Calibration +3 more -
Utah Scale Center
Utah Scale Center offers servicing and calibrating of industrial scales across the Rocky Mountain Region, with 70+ years of experience.
Calibration ServicesScale Calibration -
Washington Calibration
Washington Calibration has been providing customers with quality gage repair services for all their inspection measuring instruments for more than 34 years.
Calibration ServicesDimensional Calibration Force Calibration Mass Calibration Pressure Calibration Temperature Calibration +1 more
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Audit-Ready Calibration in 3 Simple Steps
Submit Your Equipment List
Send us a list of the equipment you need calibrated, and we’ll provide a tailored quote with clear pricing—no hidden fees.
Schedule Your Calibration
Choose a convenient time for a mobile or on-site equipment calibration. Our certified technicians ensure precision and compliance with ISO/IEC 17025 standards.
Stay Compliant & Audit-Ready
Receive detailed calibration reports and certification, giving you peace of mind for audits and operational excellence.
Frequently Asked Questions
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What is the difference between mass calibration and scale calibration?
Mass calibration refers specifically to the calibration of reference weights and mass standards — the physical objects used as known references. Scale calibration involves testing the performance of a weighing instrument using those reference weights. Both are important components of a complete weighing system, and both should be part of a calibration program for facilities where accurate weighing is critical.
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What OIML or ASTM classes of weights are used in mass calibration, and why does weight class matter?
Mass standards are classified by tolerance — organizations like OIML and ASTM define weight classes based on acceptable deviation from nominal value, surface finish, and material requirements. The class of weight needed depends on the accuracy requirements of your weighing instruments — a highly precise analytical balance requires higher-class reference weights than a general-purpose industrial scale.
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How does the environment affect mass calibration and weighing accuracy?
Factors such as air currents, temperature gradients, magnetic fields, and humidity can all influence weighing results. Air buoyancy in particular has a measurable effect when weighing at high precision because air exerts a buoyant force on both the weight and the object being weighed. Accredited mass calibration labs control these variables and apply appropriate corrections to ensure results are traceable and accurate.
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How often should reference weights be recalibrated?
The appropriate recalibration interval for reference weights depends on how frequently they are used, how carefully they are handled, and the accuracy requirements of the measurements they support. Weights used in highly regulated environments — such as pharmaceutical manufacturing or legal metrology — typically require more frequent recalibration than those used in less demanding applications. Reviewing calibration history and looking for trends in drift can help determine the right interval.
