VTF gauge

Don't waste your money. Measuring at the exact height of the album is not critical. What is critical is that you can make accurate measurements repeatedly. The manufacturer provides a VTF range  because each sample might vary slightly for any given model. You need to find out the VTF that works for yours in your system, with your preferences. Start with the median of the recommended range and move up of down. 0.1 or 0.2 g make a difference. To do that accurately, your scale needs to be on the same surface  (i.e. at the same height) each time you measure.