Test Weights for Scales - choose best quality lab weights

    Test Weights

    Perfectly designed to support testing and calibration of balances


    Test Weights for Scales & Balances

    METTLER TOLEDO's world leading expertise in metrology extends to test weights, weight sets and weight calibration services. The weight portfolio covers weights according to OIML or ASTM from fifty micrograms to five tons in all accuracy classes. Our test weights are used all over the world, not only for testing balances but also as primary standards in mass laboratories.

    The proprietary electrolytic polishing process for knob and wire weights in the upper class range eliminates microscopic protrusions in the weight’s surface which is far smoother compared to mechanical polishing. Thanks to the enhanced properties of the passive oxide film, long-term stability of the test weight is improved.

    Choose from a comprehensive selection of test weights and related calibration services. We offer weights and services of the highest quality – even for users with limited budget. Building on many years of experience and customer feedback, our weight boxes and accessories have an unmatched reputation. Profit from short recalibration times and trustworthy  services with our global network of accredited mass laboratories.

    Test your balances securely, and in accordance with USP <41>, by using just two test weights to test at 5% and 100% of the capacity of each balance. Not only is this unique approach much faster, but purchasing and recalibration costs are substantially reduced. CarePacs® include tweezers, gloves and other accessories for professional weight handling.  

    The unique weight identification system "WeightLink™" works with the balance firmware to cross-check the weight against its calibration certificate, making it impossible to test using the wrong weight. With weight parameters transferred electronically to the balance, the system guarantees full traceability thus data integrity is given.

    Calibration Weights
    Precision Weights

    Calibration Weights

    Precision Weights


    High-grade stainless steel knob and wire weights for balance calibration purposes and reference usage for weight comparisons. (OIML E1, E2, F1)
    Stainless steel knob and sheet weights for routine testing to ensure reliable weighing processes. (OIML F1, F2, M1 and ASTM class 1, 2, 3, 4)
    WeightLink™ is an innovative weight identification system that guarantees full traceability of your balance tests
    Positive Tolerances Only
    A far longer life span thanks to guaranteed positive tolerances
    Lifetime Guarantee
    Replaced free of charge if found out of assigned OIML tolerance
    Vacuum Melted Steel – Highest Material Purity
    No dissolved gases and improved oxide cleanliness
    Electrolytic Polishing – Best Surface Smoothness
    Enhanced properties produce unmatched stability
    One-Piece Design
    For improved mass stability
    Made in Switzerland – Solid Name, Solid Products
    Traditional manufacturing meets new technologies
    Cost Savings with CarePacs®
    Buy only the recommended weights for routine testing
    Time Savings with CarePacs®
    Easy, rapid testing approach supported by SOPs
    Safe Shipment and Protected Storage
    Supplied in a FDA-compliant and easy to clean plastic box
    Made Exclusively from Stainless Steel for Longevity
    Excellent weight life span right down to the mg range
    Two-Piece Design
    For optimized adjustment processes
    Proven Traceability
    Use weights with unique ID marked as a matrix code on the weight
    Secure Balance Testing
    Balance firmware validates certificate and weight data before starting balance test
    Improved Productivity
    Automatic transfer of weight parameters into balance firmware
    Complete Reports
    Enriched test printout means less manual recording
    Easy Use
    Balance firmware guides through the testing process
    Tailored Weights in custom shapes, materials and values
    Heavy-duty Weights for Scales

    Tailored Weights

    Heavy-duty Weights for Scales

    Test weights and artifacts for specific needs such as nominal values in the microgram range, or tailored weights shaped for specific applications.
    Stackable stainless steel or cast iron weights for testing of scales with capacities up to several tons. (OIML F1-M3)
    Microgram Weights
    For areas where milligram weights are no longer sufficient
    Buoyancy and Volume Artifacts
    For meeting specialized application needs
    Silcon Spheres
    As a reference for specialized volume measurement
    Service Technician Weights
    For sure and productive calibration processes
    Save Testing and Lifting
    Standardized design for safe stacking and to fit fork lifts
    Fast Testing
    Hoist-friendly design for efficient handling
    Suited to Harsh Environments
    Designed for heavy-duty operation under challenging conditions
    Finest Material
    Suited for industries requiring wash-down test equipment
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