Need help with Ortofon stylus force gauge

I've spent the day assembling a Teres 265, Illustrious arm and Shelter 901 for a friend. Included in the package is an Ortofon stylus force gauge which reads in mN. The only clue I have about this piece is that 10 mN = 1 gram. I would like to set it at 1.8 grams for starters since the range for this cartridge is 1.4 - 2.0 grams. Does 18 mN equal 1.8 grams? Also, this is a lever type scale with a groove along the scaled end. Do I place the stylus where this 18 mN would be and adjust the counterweight so that the balance itself is level like two equal weights on a teeter totter? I hope I've made this clear. I'm hoping for some input from someone that has experience with the particular gauge. Thanks.

Patrick