When using Go!Link, order code GO-LINK, $69 or EasyLink, order code EZ-LINK, $67 with a Colorimeter, order code COL-BTA, $119 on the 565 nm setting, you may occasionally see a bad value, typically 108% T, after calibration. This value should be closer to 100% T. This problem is rare, so if you have multiple sensors and interfaces, try different combinations and you will likely find combinations that work properly.
If using the 565 nm LED is critical to your experiments, you may want to consider using LabQuest Mini, order code LQ-MINI, $149 or LabQuest 2, order code LABQ2, $329 as an interface or use Go Direct® Colorimeter, order code GDX-COL, $119 which requires no interface.
Other related TILs
TIL 1367: Colorimeter Troubleshooting and FAQs