noun
General term for an instrument that measures physical quantities such as weight, length, volume, or flow.
この計量器で荷物の重さを測ってください。
Please weigh the package with this scale.
工場では様々な計量器が使われて
Various measuring instruments are used in the factory.
はかり is the common word for a scale or balance, often used in everyday contexts. 計量器 is more technical and covers a wider range of measuring devices.
Compound of 計量 (measurement, weighing) and 器 (instrument, device).