Hi @clf 1. The metrology standards require annual verification or calibration of devices... It depends on your requirements how often do you want to perform such. The AD1 and AD2 I use day by day is still measuring fine since 3 and 6 years. 2. Digilent does not offer calibration services. See the links below about calibration. The trimmers on the scope inputs are mechanical so this might require adjustment, but other parts of the devices are ceramic and silicon which should be st