Ergometers are sophisticated measurement instruments. As any measurement instrument they need to be calibrated regularly. In some countries there is even a legal obligation to do this with a frequency of once per year or once per 2 years.
If you have many ergometers you may consider to buy a calibration device yourself and follow a course at Lode BV.
In other cases you can contact your dealer for calibration. In most cases they can provide calibration as a service. Many Lode dealers are trained to do calibration. They could provide this within a calibration and maintenance contract but also a seperate service.
If you cannot locate your dealer you may contact Lode so that we can establish contact.