I just get a Feelworld new released monitor F7. It is a 7 inch full HD monitor 1920x1200. Both HDMI in and out support 4K UHD 3840×2160p .
It is IPS panel, and you will have a 160° wide viewing angle.
It is with many advanced Features, such as:
*Histogram
*Focus Assist
*False Color
*Zebra Exposure (0-100IRE adjustable)
*Nine Grid (Zoom one of the images to realize the full screen)
*Embedded audio meter
*Camera Mode
*Scan Mode (Auto, Over Scan, Full Screen)
*Zoom (Auto,4x,9x,16x)
*Anamorphic Mode (1.3x,2.0x,2.0x mag)
*Pixel to Pixel
*Center Marker, etc.
I think it is really nice, and is a cost-effective solution.
http://www.feelworld.cn/ShowInfo.aspx?id=481&py=FEELWORLD-7-IPS-Full-HD-1920x1200-4K-HDMI-Input-Output-On-Camera-Monitor-F7