Is this a good reality check?

Hey there, dreamers.

I decided yesterday to start training for lucid dreaming. I had a fantastic (unintentional) lucid experience a few months ago and was hoping to gain a little more control over when I could experience this.

I read through the MILD technique and have started the dream journal as well as performing regular reality checks whenever I realize I am in a new environment. The check is this:

Using one hand, grab the fingers of the other hand in order and count to ensure that there are five, then repeat with the other hand.

Is this a proper check? I obviously won't know for sure whether it is effective for a little while (I'm not expecting instant success), but I would love to know if there is something that you do personally that you find reliable.

Thanks much!