The tutor tells how to access the built-in ε_ο constant on the Sharp el-520w.

The Sharp el-520w has 52 built-in constants relating to physics, chemistry, etc.

Here’s how to call up ε_ο, which has value 8.85×10^-12:

1. Press the CNST key, and you’ll be asked which of constants (01-52) you require.
2. Key in 13. You’ll see 8.854187817×10^-12 appear.

Source:

Sharp Scientific Calculator Model EL-520W Operation Manual.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.