Calibration Weights/Test Weights

Shop Calibration Weights Online

The calibration and test weight products on our site are from the A&D, Ohaus, and Rice Lake Weighing brands. Products include: cast iron grip-handle field weights, cast iron field weights, ASTM precision mass reference standards, ASTM balance calibration weights, ASTM stainless steel field weights, ASTM specialty calibration weights, and OIML precision weights. Our dedicated customer service team is ready to ensure you receive precisely what you need.

Choosing the Correct Test Weights for Scales

The precise test weight required largely depends on the specific type of scale you have and its capacity. Test weights are categorized into groups, ranging from Class 1 to Class IIII. After determining your scale class, you then need to identify the appropriate weight class.

• ASTM Class 5: These weights are used in commercial weighing (Legal For Trade) for Class III weighing devices.
• ASTM: Classes 0-4 are designed for laboratory and high-precision uses. Classes 5-7 are intended for industrial use.
• OIML Class E2, F2: These high-precision weights are used in laboratories with Class II weighing devices.

Different Types of Test Weights for Scale Calibration

• Cast iron calibration weights come with a grip handle and feature a nest-like style slab. We offer cast iron test weights with slotted, hanger, and interlocking functions in ASTM Class 6 and 7.
• Counterpoise and hanger cast iron test weights are also available in ASTM Class 6 and 7.
• ASTM Class 5 avoirdupois and metric weights are crafted from stainless steel and are mainly used as field standards for scales and balances.
• The ASTM Class 5 individual specialty calibration weights offer unique features for custom use. ASTM electronic calibration kits are designed to calibrate balances in Classes 1 and 2.
• ASTM precision laboratory metric calibration sets offer a range from 500 mg, 20 g, 50 g, 100 g, and 200 g, and they are used to test balances while exceeding an E617-13 specification.

Calibration Weights by Brand

Certified Scale currently offers calibration weight solutions from the industry brands: Rice Lake Weighing, Ohaus, and A&D. Please browse our current offerings for some of the highest quality calibration/test weight products in the industry, or contact our team with questions!

Rice Lake Weighing Calibration Weights

Our heavy duty cast iron, mild steel, and stainless steel weights from the Rice Lake Weighing brand assist users in accurately weighing for ratio counting and other various weighing operations. You’ll see that much of our stock feature the Fairbanks slotted interlocking counterpoise weights. Our Rice Lake Weighing calibration weight products also include our Howe counterpoise hanger weights and our weight sets.

Ohaus Calibration Weights

Introducing our Ohaus calibration weights, available as weight sets for various weighing solutions. These Ohaus weights offer users high levels of accuracy with tight tolerance capabilities (less than 1/4 of the tolerance). With these Ohaus weight sets, you can use Class 1 as a primary reference to calibrate other mass standards and use for traceability between national mass standards and ASTM Class 2 weights and lower. Please browse all our Ohaus calibration weights online today, or contact our team with questions.

A&D Calibration Weights

A&D is one of the weighing industry’s most high-quality, recognized industry brands. At Certified Scale, we currently offer the A&D calibration mass, 20g, which is a Class I weight, with a screw knob and glove, and with no certificate. Please browse all our A&D calibration weight product offerings here, or contact the Certified Scale team with any inquiries.

Calibration Weights FAQs

Where to buy calibration weights?

You can purchase calibration weights and test weights from a variety of suppliers either online or offline. If you’re shopping online, Certified Scale is an excellent resource of many calibration/test weight solutions. Our team offers a wide range of high-quality, certified weights for various applications and calibrations. Our weights are from the trusted and well-known A&D, Ohaus, and Rice Lake Weighing brands.

What are calibration weights used for?

Calibration/test weights are used to adjust and test the accuracy of electronic and mechanical weighing scales. They are essential for making sure that your scale(s) are producing accurate measurements. These weights can help meet standards for contractual jobs, military contracts, pharmaceutical manufacturing, and ISO 9000 alike.

How are calibration weights made?

Calibration weights are typically constructed from durable materials such as cast iron or stainless steel. First, the weight is carefully crafted to the required specifications. Once the raw weight is formed, it is polished and treated to prevent corrosion. Lastly, it’s calibrated to the specific weight class to ensure utmost precision.

How should I handle calibration weights?

Prior to using your calibration weight product, make sure to have it sit in its dedicated container near its intended balance to acclimate to the surrounding temperature. Don’t place any weights near it. Also, a note on keeping it clean: always use clean gloves and tweezers. Your weight should be stored in a clean, dry, and stable environment. After using your calibration weight, be sure to clean it with a soft, lint-free cloth and return to its protective case.

Why Calibration Weights from Certified Scale?

At Certified Scale, we pride ourselves on being a reliable provider of the highest quality calibration and test weights in the market. If you’re searching for calibration and test weights, look no further than our online store. Explore our range of weights today, contact us here, or reach out to our team at (800) 455-9107.

Certified Scale has been delivering exceptional service to our valued customers since our inception in 1969. We are committed to providing prompt and expert weighing solutions for our clients. Don’t hesitate to contact us for the appropriate weighing equipment you need.