punnukset

Punnukset are standardized masses used to calibrate and verify the accuracy of weighing devices such as balances and scales. They provide known, precise quantities that enable users to check measurement accuracy in settings ranging from laboratories and pharmacies to jewelry shops and industrial production.

Punnukset typically come in sets that cover a broad range of masses, from a few grams to several kilograms. They can be solid individual weights or modular, where larger masses are formed by combining smaller weights. Denominations are usually labeled in grams or kilograms, and weights are designed to be traceable to national or international metrology standards.

Materials and construction vary, but common choices include stainless steel and nickel-plated steel, which offer durability and resistance to corrosion. Some lower-cost weights may be made of brass. Each weight is marked with its mass, and often with a maker’s mark and an indication of calibration status. Higher-precision sets are supplied with a calibration certificate and stored in protective cases or racks to minimize handling damage and contamination.

Standards and traceability are central to the use of punnukset. Weights used for calibration are typically calibrated against national standards and may be classified by tolerance according to metrology authorities. Regular recalibration ensures ongoing accuracy, especially in precision environments.

Handling and maintenance emphasize careful use and storage. Weights should be kept clean, dry, and free from oils or residues; they should be stored in a controlled environment to prevent changes in mass due to humidity or temperature. When not in use, punnukset are often handled with clean gloves or tools to preserve their accuracy.