The verification of the measuring instrument is thatThe metrological and other characteristics of certain objects and their similarity with passport data are checked. Such actions are carried out by specially designated persons in the designated premises, while using specialized equipment. These actions are called - verification scales.
Types of verification
- Primary verification is carried out at the time of the release of scales from production or after repair. Also, this procedure is carried out during import.
- Periodic verification is applied to those verification tools that have already been put into operation. It is held once a year.
- An extraordinary verification is applied when any technical damage occurs, also if the balance has been kept for a long time and then put into operation.
- Inspection verification is carried out during metrological supervision.

Stages of bench scale weighting
In total, there are three stages.The first stage is to verify without applying the load. At this stage, it is checked how correctly the scales are installed, and how they react to the attempt to unbalance them. At the second stage, the verification is carried out using a weight, the mass of which is approximately 1/10 of the load from the largest weighing limit. Weights are usually placed in the center and on the sides, the readings should be equal to the mass of the weight. The third stage determines the accuracy with which the scales operate, taking into account the maximum load. In this case, the weight is set only in the center, while the sensitivity of the weight is not checked.
Weights calibration methods

Electronic balance

Scale verification (frequency of this procedure isonce a year) is carried out in accordance with the legislative documents “On Metrology and Metrological Activities”. All scales in service shall be subject to periodic verification.
Scale Calibration Technique

The documents on the operation of the scales spelled outconditions that must be strictly followed. When the scales are being calibrated, the temperature, humidity, and atmospheric pressure must clearly correspond to the working indicator. During an external inspection, the absence of cracks and corrosion is usually established; all control items must be in their places, according to the operating documents. If it is a crane device, then in the passport there should be a certificate of its strength testing of the crane hook. At the time of testing the scales, it is necessary to identify how good they are, whether the control apparatus is not overloaded. During the determination of metrological boundaries, the inconstancy of the readings of the scales is checked in the absence of any loads. Metrological boundaries are calculated using the weights of the 4th digit. If the results of verification turned out to be positive, then this is noted in the passport and a stamp is made on the scales, which indicates the suitability of the scales for use. If the result of verification is negative, then the scales are not applied.