We calibrate the Verathon BVI 9400 bladder scanner in house in conjunction with the calibration tank, you have to have a licence from verathon I think, and be connected to the internet as they can diagnose any issues when you are carrying out the calibration.
The probe sits in the lid of the calibration tank and is submerged in the water and the unit carries out a calibration. You then get a calibration certificate to keep for your records

Last edited by Sab3112; 19/10/16 2:35 PM.