The Tektronix 5116 is a single beam mainframe that has a colour LCD shutter in front of the CRT.
The color shutter works only with the 5D10 digitizer plug-in. The 5116 manual says "The 5116 will not produce color signals if the 5D10 Waveform Digitizer does not have a serial number of B020100 or greater."
In contrast with what is mentioned sometimes, the 5116 does not provide alphanumeric readout. The 5D10 takes care of this.