What is the difference between a 7490 and a 7492?

• 7490 is a MOD-12, 7492 is a MOD-10
• 7490 is a MOD-12, 7492 is a MOD-16
• 7490 is a MOD-16, 7492 is a MOD-10
• 7490 is a MOD-10, 7492 is a MOD-12