Graphing with picturebox

Hello,

Im making my graphing app with a picturebox, and I just bumped into a tricky question. What if I want to graph values from 0.002323 to 0.002360? Ive tried with this

VB Code:

picture1.scaletop = 0.002330
picture1.scaleheight = -0.002330

and just it doesn work, I get a straight line, Im guessing the picturebox just rounds the number since it cant deal with small numbers....any ideas (besides removing the decimal point to get integers). thanks.