Android - Does a device with no physical SIM slot have an IMEI?

I had a look at a tablet which does not have a SIM card slot and it does not have an IMEI number in the About Tablet settings menu.

This answer on StackOverflow should help you find an ID for a device with a SIM card slot and for those devices without.

I am answering my own question, because I finally found a definitive answer. This S.O post says

"Google's CTS require that getPhoneType of TelephonyManager needs to be none and getDeviceId of TelephonyManager needs to be null for non-phone devices."