ISO/IEC 17025 Accredited Calibration for AASHTO-Accredited Labs 

AASHTO accreditation demands precision, and your calibration provider has to meet that standard too. Accredited Labs is the largest CMT calibration services provider in the United States, with 40+ locations nationwide and ISO/IEC 17025 accreditation across the full range of construction materials testing disciplines. We know the equipment you use, the standards you're held to, and what it takes to keep your lab compliant and audit-ready. 

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Calibration Services for AASHTO-Accredited Labs 

Maintaining AASHTO accreditation means your testing equipment has to perform every time, on every project. From concrete and asphalt to soils and aggregates, the instruments your lab depends on must be calibrated to traceable standards, documented to satisfy assessors, and serviced by technicians who understand the demands of accredited CMT work. 

When testing equipment drifts out of calibration, the consequences extend beyond a failed assessment. Structural failures, project delays, regulatory violations, and safety hazards are all on the line. The Accredited Labs network provides comprehensive CMT equipment calibration services built specifically for the accuracy and compliance requirements of AASHTO-accredited laboratories.

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Our Process 

Construction materials testing equipment calibration involves verifying and adjusting instruments that evaluate concrete, asphalt, soil, aggregate, and other materials used in construction projects. Each instrument is compared to certified reference standards, including proving rings, load cells, and dimensional gauges, to identify any deviations from AASHTO and ASTM specifications.

During calibration, technicians evaluate the instrument across its full testing range, assess system performance, verify dimensional accuracy, and document all variations. If an instrument cannot be brought back into specification, you receive detailed reporting with the data needed for corrective action or replacement planning.

Every calibration follows AASHTO testing specifications and ASTM International standards, ensuring consistency, reliability, and full measurement traceability. Each instrument is returned with documentation linking its accuracy to national measurement standards, supporting your accreditation requirements and quality system obligations.

FREE DOWNLOAD  

CMT Equipment Calibration & Audit Readiness Checklist


Our free download gives you a practical, equipment-specific checklist covering concrete, asphalt, aggregate, and soil testing instruments — with calibration criteria, interval guidance, and the items most commonly cited in ISO/IEC 17025 and AASHTO assessments.


Download it now and be ready for every audit.

Types of Construction Materials Testing Equipment We Calibrate

Our comprehensive construction materials testing equipment calibration services cover the complete spectrum of instruments used for construction materials evaluation:

  • Concrete Compression Testing Machines: Hydraulic and digital compression testers that determine concrete compressive strength through cylinder and cube testing. These critical instruments require calibration using certified proving rings or load cells to ensure accurate strength determination for structural concrete acceptance and quality control.

  • Concrete Flexure and Tensile Testing Equipment: Testing machines that measure concrete flexural strength, splitting tensile strength, and modulus of rupture for pavement design and structural applications. Calibration ensures accurate strength characterization for engineering design and quality verification.

  • Asphalt Marshall Stability Apparatus: Complete systems including loading frames, flow meters, and water baths used for asphalt mix design and quality control testing. Calibration verifies load measurement accuracy, deformation measurement, and temperature control that determine asphalt mixture performance characteristics.

  • Nuclear Density Gauges: Portable instruments using radioactive sources to measure soil and asphalt density and moisture content in field applications. These regulated devices require specialized calibration procedures, radiation safety compliance, and documentation for regulatory agencies and transportation departments.

  • Sand Cone and Rubber Balloon Density Equipment: Field density testing apparatus used for soil compaction verification requiring calibration of volume measurements, sand densities, and calculation procedures that determine in-place soil density for earthwork quality control.

  • Proctor Compaction Equipment: Laboratory compaction apparatus including compaction hammers, molds, and accessories used to determine optimum moisture content and maximum dry density for soil compaction specifications. Calibration ensures proper compactive effort and accurate density determination.

  • Concrete Air Content Meters: Pressure-type and volumetric air meters that measure entrained air content in fresh concrete for freeze-thaw durability and workability control. Calibration verifies pressure accuracy and volumetric measurements critical for durable concrete production.

  • Concrete Slump and Flow Testing Equipment: Slump cones, flow tables, and workability testing apparatus used to evaluate fresh concrete consistency and placement characteristics. Calibration ensures proper dimensions and measurements for workability specification compliance.

  • Sieve Analysis Equipment: Complete sieve sets, sieve shakers, and gradation analysis equipment used for aggregate quality control and mix design proportioning. Calibration verifies sieve opening dimensions and shaker performance for accurate particle size distribution determination.

  • Aggregate Testing Equipment: Instruments for aggregate specific gravity, absorption, soundness, and deleterious substances testing that characterize aggregate quality and performance. Calibration ensures accurate property determination for mix design and quality specifications.

  • Soil Classification and Atterberg Limits Equipment: Testing apparatus for liquid limit, plastic limit, and plasticity index determination used for soil classification and engineering property correlation. Calibration verifies equipment dimensions and performance for accurate soil classification.

  • Pavement Coring Equipment and Core Analysis Tools: Diamond coring machines and core dimension measurement tools used for in-place pavement evaluation. Calibration ensures accurate core recovery and dimensional measurements for pavement assessment and quality verification.

  • Moisture and Humidity Testing Equipment: Ovens, moisture analyzers, and humidity chambers used for moisture content determination in concrete, soil, and aggregates. Calibration ensures accurate temperature control and moisture measurement for proper material characterization.

  • Temperature Measurement and Control Equipment: Thermometers, temperature probes, and environmental chambers used throughout materials testing for temperature-sensitive tests and curing control. Calibration ensures accurate temperature measurement and control for valid test results.

Find Construction Materials Testing Equipment Calibration Services

Showing 28 companies
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  • Accutek Lab

    Accutek Lab has been providing reliable and cost-effective pipette calibration services across the United States since 1996.

  • Aldinger

    Since 1972, Aldinger has been providing top-quality calibration services for test and measurement equipment in Texas and beyond.

  • Cal-Cert

    Cal-Cert is committed to providing the highest level of calibrations and certification service to our customers.

  • Cal-Labs

    Cal-Labs has provided quality calibration in Southern California since 1977. We are A2LA accredited to ISO 17025. 

  • 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.

  • Cal Tec Process Management

    The calibration specialists at CTPM have been providing precision calibration and quality assurance since 1987.

  • Calser Calibrations

    Since 1979, Calser Calibrations has delivered trusted, precision calibration services backed by a commitment to quality and reliability.

  • CMG Sales, Inc.

    CMG Sales, Inc. is a leading manufacturer sales representative and ISO 17025 accredited calibration laboratory providing services to manufacturers nationwide.

  • 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.

  • 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.

  • Holts Precision, Inc.

    For over 60 years Holts Precision, Inc. has performed calibrations & repairs on all major brands of gaging equipment.

  • 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.

  • 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.

  • IPM, Inc.

    Industrial Process Measurement, Inc. has been in the instrument supply, service and calibration business for over 30 years.

  • J & J Calibration Service

    J&J Calibration Service, an ISO-17025 accredited company, offers unmatched mobile calibration capabilities and laboratory calibration services.

  • OCS Technologies

    Founded in 1930, OCS Technologies is a trusted multi-discipline calibration service provider as well as leading product distributor.

  • OnCal

    With over 23 years of experience in pipette calibration in the Pacific Northwest, the OnCal Corporation guarantees seamless and dependable metrology services.

  • 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.

  • 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.

  • Quality Control Services

    Quality Control Services is an established, accredited calibration services and laboratory equipment company with over 40 years of experience.

  • 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.

  • Scale Service & Supply

    From laboratory balances to truck scales, Scale Service & Supply has been providing precision calibration for weighing systems since 1987. 

  • Servo Innovations

    Servo Innovations, founded in 2005,  has earned industry-wide trust for its accredited calibration, repair, and technical services.

  • Tescom Calibration Services

    Tescom Calibration Services has provided sales, repair, and calibration of telecom test equipment since 1982.

  • Trident Calibration Labs

    Serving the greater Phoenix area, Trident Calibration Labs has more than 100 years of combined calibration experience.

  • 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. 

  • Utah Scale Center

    Utah Scale Center offers servicing and calibrating of industrial scales across the Rocky Mountain Region, with 70+ years of experience.

  • Washington Calibration

    Washington Calibration has been providing customers with quality gage repair services for all their inspection measuring instruments for more than 34 years. 

Request a Calibration Service from the Accredited Labs Network