Digital scales typically don't calibrate themselves automatically, but they often have a calibration feature that allows users to calibrate them manually. Here's how it generally works:

Manual calibration: To calibrate a digital scale manually, users typically need to follow the instructions provided in the scale's user manual. This usually involves placing a known weight (such as a calibration weight) on the scale and then using the scale's calibration function to adjust the internal settings until the scale displays the correct weight.

Calibration weights: Calibration weights are specially designed weights that have been accurately calibrated to a known weight value. They are used to calibrate digital scales and ensure their accuracy. Users can purchase calibration weights separately if they don't come with the scale.

Calibration procedure: The calibration procedure for a digital scale may vary depending on the manufacturer and model. However, it usually involves placing the calibration weight on the scale, entering the calibration mode (often by pressing a combination of buttons), and then following the on-screen instructions to complete the calibration process.

Frequency of calibration: The frequency at which calibration should be performed depends on several factors, including the scale's usage, environmental conditions, and manufacturer recommendations. In general, it's a good idea to calibrate a digital scale regularly to ensure accuracy. For most home users, calibrating the scale every few months or as needed should be sufficient. However, in commercial or industrial settings where accuracy is critical, calibration may need to be performed more frequently, such as monthly or even weekly.

Environmental factors: Changes in temperature, humidity, and altitude can affect the accuracy of digital scales over time. Therefore, it's essential to store the scale in a stable environment and recalibrate it periodically to compensate for any changes.

Manufacturer recommendations: It's always a good idea to follow the manufacturer's recommendations for calibration frequency and procedure, as outlined in the user manual or documentation provided with the scale. This ensures that the scale remains accurate and reliable throughout its lifespan.

Overall, regular calibration is essential for maintaining the accuracy of digital scales and ensuring consistent and reliable weight measurements.