Calibration Weights & Kits
Calibration weights and kits are the reference standards that let a lab prove its balances read true, so choosing the right class and range matters as much as the balance itself. Listings cover individual weights, boxed sets and complete kits across the accuracy classes used to verify and adjust weighing equipment throughout the Weighing, Measurement & Calibration range. You can match weight class to balance readability, confirm certification status, and contact sellers directly about condition and traceability. Finance on qualifying listings can spread the cost of equipping a full verification programme with new or used calibration weights.
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£50
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Global Marketplace
Calibration Weight & Kit Types
Calibration weights are chosen by accuracy class, material and how they are supplied. The variants below cover what labs typically buy.
Individual reference weights
Single weights of a defined nominal value and class for checking a specific point on a balance. They let you build a set tailored to your instruments.
Boxed weight sets
Graduated sets that cover a range of nominal values in one case for full-range verification. They suit labs checking balances across their whole span.
High-tolerance analytical weights
Tight-class weights matched to analytical and semi-micro balances. Their small tolerance is essential for verifying fine-readability instruments.
Handling accessories and cases
Forceps, gloves and protective cases that prevent contamination and wear during use. Careful handling preserves a weight's certified value over time.
Brands on Machinery Masters
Sellers list calibration weights and kits from recognised metrology suppliers whose standards are widely accepted for traceable verification. The names below are drawn from live Calibration Weights & Kits listings and refresh as sellers add and sell equipment.
Latest Calibration Weights & Kits Listings
Why Choose Machinery Masters
Verified Sellers Only
Every seller is verified before a single listing goes live. Machinery Masters also reviews listings for accuracy, so buyers can commit to high value machinery with confidence.
Global Reach
Listings come from sellers across Europe, North America, and beyond. That reach widens the options past any regional dealer network, and it is often the only way to find discontinued models in good condition.
Flexible Financing Options
Qualifying listings carry financing through partner providers. Terms are shown directly on eligible product pages, spreading the cost instead of draining working capital in one hit.
Direct Seller Contact
No broker sits between the buyer and the seller. Ask about service history, arrange inspections, and negotiate directly with the person who actually knows the machine.
Applications and Uses
Calibration weights support the accuracy of any programme that depends on weighing. The settings below show typical use.
Routine balance verification
Labs check balance accuracy at defined intervals using weights of the correct class. Regular verification keeps weighings traceable and defensible.
Balance calibration and adjustment
Metrology staff use reference masses to calibrate and adjust balances across their range. Correct class selection ensures the adjustment is meaningful.
QC and audit readiness
Regulated labs keep certified weights on hand to demonstrate traceable weighing during audits. Documented verification supports quality systems.
Field and portable balance checks
Teams carry weight kits to verify portable balances used outside the main lab. On-site checks confirm field weighings remain reliable.
Benefits from Machinery Masters
Machinery Masters keeps calibration weights beside the balances they verify and connects you with the owners who hold the certificates.
Weight classes for every balance you check
From tight-class analytical masses to workshop sets, the range lets you pair the correct tolerance with each instrument's readability in one search.
Certified kits without the new set premium
Surplus and lightly used calibration weight kits often list at keen prices when a lab reorganises, and financing on qualifying listings keeps a full programme affordable.
Certificates confirmed with the current keeper
Talking directly to the seller lets you check accuracy class, nominal values and certificate dates before the weights underpin your traceability.
Frequently Asked Questions About Calibration Weights & Kits
Match the weight class to the balance readability, as finer instruments need tighter-tolerance masses to verify them properly. Too loose a tolerance simply cannot confirm a fine-reading balance. Confirm the class and nominal values with the seller against your instruments. Selecting well keeps your verification valid.
Traceability usually depends on a calibration certificate, so ask whether one is included and how recent it is. Certified masses may need periodic recalibration to stay traceable. Factor a recalibration into your plan if the certificate is older. Confirmed certification supports the credibility of your weighing checks.
Handle them with forceps or gloves to avoid transferring contamination that alters their mass. Store them in their case, away from moisture and dust. Ask the seller about the condition of the weights and case. Careful handling preserves the certified value you are relying on.
You can combine individual masses to cover the points you check most, or buy a graduated set for full-range work. Choose based on which instruments you calibrate and at what values. Confirm nominal values with the seller to fill any gaps. A tailored kit gives efficient coverage of your instruments.
Marketplace sellers are named, which lets you ask for photographs, class details and certificates directly. Ask about the condition of each weight and how it was stored. Dealing with the owner gets your queries to the person who holds the kit. That directness helps you commit to a set without doubt.