Here is a handy tool that wirelessly transmits an HDMI signal to your phones and tablets, allowing them to serve as a professional monitor. The Accsoon CineEye can handle signals up to 1080p60 and send signals to 3 separate iOS/Android devices.
The signal is sent over 5G WiFI up to 328′ line of sight with low latency of 60ms. It is designed to resist interference. The companion app gives you handy features such as false color, peaking, zebra, and histogram, as well as .cube format 3D LUT support.