I just bought one of these and decided to check it out. Has anyone heard of it before? Its supposed to let you know if you have anything going on in your oil! I checked mine after 2500 miles and its showing between the good and excellent range. I like it so far! Besides, I have wasted far more that 39.95 before in my life

Lubricheck - The digital 'blood tester' for your car

 

I got one too, haven't tried it yet, truck is in storage.

 

I would be inclined to use the lubricheck and compare it to a Blackstone analysis.

IE: If you are looking to run extended drain intervals use the lubricheck to check the sample that you are sending to blackstone and see if they both indicate "change" at the same time.