The TID rollover functionality could not be tested prior to 2014, due to a lack of appropriate testing infrastructure

 The TID rollover functionality has been a requirement since 1993, so all meters should comply

 There is a small risk that some of these meters might not behave correctly when a TID rollover key change is performed

 The STS Association is assisting with identifying these meters and provides free of charge services to re-test samples of these meters