The AJA Hi5 HD/SD-SDI to HDMI Video and Audio Converter with DWP converts an SDI signal to HDMI for monitoring on an HDMI display. 8-channel embedded audio gets passed as well. Additionally 2-channel RCA outputs are available for separate audio monitoring. Linked to the SDI input is an equalized SDI loop-output that can be used for outputting to an SDI monitor at the same time as to an HDMI monitor.
 
https://www.bhphotovideo.com/c/product/899157-REG/AJA_hi5_HD_SDI_SDI_to_HDMI_Video.html