ISO/IEC 17025 Accredited Proof Load Testing

Worker safety and equipment reliability depend on lifting systems performing as designed. Our national network of local brands delivers precise proof load testing so you can verify equipment performance, protect personnel, and reduce costly risks.

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Our Proof Load Testing Services

Hoists, cranes, and lifting equipment must reliably handle their rated loads to prevent accidents and equipment failures.

When lifting systems fail, the consequences can be severe—serious injuries, fatalities, property damage, and liability exposure. The Accredited Labs network provides comprehensive proof load testing to confirm that lifting equipment performs safely and meets manufacturer specifications and regulatory safety requirements.

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Our Process 

Proof load testing involves applying controlled test loads to lifting equipment to verify structural integrity, load-bearing capacity, and safe operation at or above rated working loads. Each piece of equipment is evaluated against manufacturer specifications and regulatory safety standards.

Certified technicians apply predetermined test loads using calibrated weights or hydraulic testing systems while monitoring structural response, mechanical function, and safety components. The testing confirms that all load-bearing elements, safety devices, and control systems operate correctly under maximum and specified overload conditions.

All proof load testing follows OSHA regulations, ANSI standards, and industry safety protocols to deliver consistent, reliable verification. Each tested item receives comprehensive documentation certifying load capacity and safety compliance—supporting regulatory requirements, insurance documentation, and workplace safety programs.

Types of Lifting Equipment We Test

Our comprehensive proof load testing services cover the complete spectrum of lifting and material handling equipment used across industries:

  • Overhead Bridge Cranes: Industrial bridge cranes, gantry cranes, and jib cranes used in manufacturing, warehousing, and construction applications. Testing verifies structural integrity of bridges, runways, hoists, and all load-bearing components under maximum rated loads.
  • Mobile and Tower Cranes: Construction cranes, truck-mounted cranes, and tower cranes require proof testing to verify their load capacity and stability under various boom positions and load configurations. Testing ensures safe operation across the crane's working envelope.
  • Chain Hoists and Electric Hoists: Suspended hoisting equipment including chain hoists, wire rope hoists, and electric hoists require testing to verify load chain integrity, motor capacity, and brake system performance under rated loads and overload conditions.
  • Material Lifts and Personnel Platforms: Equipment designed to lift materials or personnel must undergo proof testing to ensure platform integrity, lifting mechanism capacity, and safety system functionality. This includes construction hoists, personnel lifts, and material handling platforms.
  • Winches and Pulling Equipment: Industrial winches, come-alongs, and pulling devices require testing to verify their rated capacities and ensure safe operation under maximum load conditions. Testing verifies cable integrity, drum capacity, and braking system performance.
  • Rigging Hardware and Lifting Accessories: Slings, shackles, hooks, spreader beams, and other rigging hardware require proof testing to verify their load ratings and ensure safe use in lifting operations. Testing verifies that accessories can handle their rated working loads with appropriate safety factors.
  • Scaffolding and Temporary Structures: Temporary lifting structures, scaffolding systems with integrated hoists, and specialized lifting fixtures require proof testing to verify their structural integrity and load-bearing capacity under design loads.
  • Specialized Lifting Equipment: Custom lifting devices, material handling equipment, and application-specific lifting systems require customized proof testing procedures based on their design, intended use, and safety requirements.
  • Lifting Magnets and Vacuum Systems: Electromagnetic and vacuum lifting systems require specialized testing to verify their holding capacity and safety release systems under rated load conditions and power failure scenarios.

Find Proof Load Testing Services

Showing 26 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.

  • 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.

  • 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. 

Audit-Ready Calibration in 3 Simple Steps

1

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.

2

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.

3

Stay Compliant & Audit-Ready

Receive detailed calibration reports and certification, giving you peace of mind for audits and operational excellence.

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Comprehensive Services

We offer a wide range of calibration services, covering various equipment 
and instruments.

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Industry Expertise

Our team has extensive experience 
across multiple industries, ensuring 
top-notch service.

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Nationwide Network

With locations across the country, 
we provide reliable services wherever 
you are.