Calibration Weights

Calibration weights are precision tools used to verify and adjust the accuracy of weighing instruments. Over time, scales and balances can experience measurement drift, leading to inaccurate readings. Regular calibration with certified test weights ensures that your equipment remains reliable and traceable to recognised standards.

These calibration weights are manufactured with tight tolerances and made from durable materials like stainless steel or brass, which resist corrosion and wear. Whether used in laboratories, production environments, or field testing, they are essential for maintaining calibrated weighing scales and ensuring compliance with quality and regulatory requirements.

Types & Classes of Calibration Weights

Calibration weights come in different forms, classes, and materials to suit various instruments and precision requirements:

Individual Weights

These are single scale calibration weights used for verifying the accuracy of specific balances or instruments. They are available in a range of nominal values for different capacities and resolutions.

Weight Sets / Kits

Calibration weight sets include a full range of weights, allowing technicians to calibrate multiple scales and instruments efficiently. Sets are typically supplied in protective cases to maintain accuracy and prevent contamination.

Accuracy / Classes

Calibration weights are classified based on international standards such as OIML or ASTM. Common classes include E1 and E2 for analytical balances, F1 and F2 for precision balances, and M1 and M2 for industrial scales. The tighter the class tolerance, the higher the accuracy.

Materials & Finishes

High-quality calibrated weights are typically made of stainless steel, brass, or cast iron. Polished stainless steel provides resistance to corrosion, while cast iron is ideal for heavy-duty industrial testing.

Pre-calibrated / Certified Weights

For critical applications, certified test weights come with calibration certificates traceable to national or international metrology standards, ensuring confidence in measurement accuracy.

Factors to Consider When Choosing the Right Calibration Weights

Choosing the correct calibration weights is crucial to achieving accurate and consistent measurements. Below are key considerations to help guide your selection:

• Required Weight Range & Resolution: Select weights that match your instrument’s capacity and smallest readable division.
• Accuracy Class / Tolerance: Choose the appropriate OIML or ASTM class based on your calibration needs
• Material & Stability: Stainless steel offers the best long-term stability and corrosion resistance.
• Certification / Traceability: Certified or pre-calibrated weights guarantee compliance with industry standards.
• Set vs Individual Handling & Storage: Weight sets are ideal for multi-instrument labs; individual weights suit single-scale checks.
• Compatibility with Balance / Scale Capacity: Ensure weights are appropriate for the instrument’s load limit.
• Protective Cases & Handling Accessories: Opt for weights supplied with gloves, tweezers, and cushioned cases to prevent surface damage.

Applications of Calibrated Weights

Calibration weights are indispensable across industries that depend on precision measurement and quality control:

• Laboratory & Scientific Research: Used to calibrate analytical and microbalances for chemical and biological experiments.
• Industrial Weighing & Manufacturing QC: Maintain consistency in production by ensuring weighing scales remain within tolerance.
• Pharmaceutical, Medical & Regulatory Environments: Ensure compliance with GMP and ISO standards for dosage accuracy.
• Food, Chemical & Material Industries: Support HACCP and QA processes through reliable weight verification.
• Metrology Laboratories: Serve as reference standards for recalibrating secondary or working weights.

Buy Precision Calibration Weights Online at RS NZ

Find high-quality calibration weights and weight sets at RS NZ, your trusted supplier and distributor of precision weighing equipment. We stock a comprehensive range from leading brands like RS PRO, Ohaus, and Kern, covering everything from analytical E1 class weights to heavy-duty M1 class industrial calibration weights.

In addition to calibrated test weights, RS also offers weighing scale accessories, and other test and measurement instruments to support your operations.

Ordering is simple and secure; just add your selected products to the cart and complete your purchase through our user-friendly checkout. We offer multiple payment methods and detailed product specifications to help you make the right choice.

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