Purchasing measurement and test equipment, such as the Series SAH SMART Air Hood® balancing instrument, in bulk or batches allows you to have a back up when the equipment you regularly use needs to be serviced, thus preventing down time. In some cases, purchasing large quantities of the exact same make and model may give users the idea that the performance of each unit can be checked by comparing one to another. Although direct comparison of similar units may be good to identify operational defects, direct comparison of units with the exact same make and model from the exact same batch / date code does not allow for detection of potential systematic errors in your product’s performance. Continue reading “Calibration Control Standards”