You can see invisible electric field - if you use "Electric Field". It is an excellent tool forvisualizing electric field and equipotential lines. Visibility of field line and potential surface depends on their magnitude. You can put unlimited number of charges in the field. Also, it can simulate electric field of charged condenser, charged wire and charged dielectric objects. "Electric Filed" have ability to measure field strength and filed potential. Supports MDI, bitmap exporting, and printing.