Samsung 28" 4K UHD LED Monitor

Samsung 28" 4K UHD LED Monitor

this is 60hz i assume?

Monitors don’t usually list a refresh rate. Here’s the samsung page:

Here’s a Q&A I found on that page:
What is the Recommended Refresh Rate for Samsung Monitors?
https://www.samsung.com/us/support/answer/ANS00011093/