Measuring Instruments
How do I make my instruments read alike?
Even instruments of the same brand and geometry may not give exactly the same absolute readings of a product. If difference measurements only are made (measuring the difference between a product standard and samples), the absolute values of the different instruments are irrelevant. However, if it is important that measured absolute values be very close together, you may hitch the instruments together. The process involves assigning one instrument to be the reference or master.