ViewSonic 43" 4K UHD Widescreen Monitor

Refresh Rate: up to 75Hz

according to reviews online the max refresh rate is 60Hz.

Specifications
43 Inches Screen (42.5 Viewable)
3840×2160 Resolution (UHD, 4K)
16:9 Aspect Ratio
IPS Panel
60Hz
12ms Response Time (GTG)
Ports: 2x HDMI, DisplayPort, DisplayPort-Out, miniDisplayPort
Other Ports: Audio Line-Out, 4x USB 3.0
Built-in Speakers: 2x7W
Brightness: 350 cd/m2
Static Contrast: 1,100:1
Dynamic Contrast: 120M:1
Pixel Pitch: 0.245 mm

Thank you. We’re verifying with the vendor.

In the meantime, we have removed that spec.