I assume that you mean the measuring device for calibration. It depends on the calibration software. You will need ColorNavigator 7. CN7 supports: Datacolor Spyder5 / EIZO EX3 Datacolor SpyderX / EIZO EX4 and many others as well
The CS2740 is a brilliant monitor for image editing. I have two of them and a third CX271 (one of my old monitors). The ColorNavigator 7 is a bit bitchy because of the different resolution of the new and the old monitor. But you can get around the software problems.
Very good tips for the CN7 settings are available as videos at Eizo Switzerland.