Hi Stan,<br>
<br>
I believe this was already answered in one of the TekScopes group, but I will answer here for others to see:<br>
<br>
The non-letter MDO4000 does not have DVM and frequency counter capabilities, so registering them does not unlock that option.<br>
<br>
For scopes that do feature that capability, you will receive an email with the license key after registering the instrument.