To calculate the difference between 2oz and 1.69oz, we can subtract the smaller value from the larger value:

Difference = 2oz - 1.69oz

First, we need to ensure that the units are the same. Since both values are in ounces (oz), we can proceed with the subtraction:

Difference = 2oz - 1.69oz

= 0.31oz

Therefore, the difference between 2oz and 1.69oz is 0.31oz.