A PE of 30 or less should be okay for considering a purchase, if you think Jim Cramer is right. If I heard him right, which is in doubt, he likes a company if it sells for less than twice its growth rate. So, if they grow earnings by 15 percent, I guess he means that a PE under 30 means undervalued. I might be out to lunch on this.
I'll wait on MFIC until I see some more sales. Their equipment isn't going to fly out the door like cell phone accessories.