FILAMENT FRIDAY E-LEVELER: This is the original Filament Friday E-Leveler that is designed, created, and featured by Chuck Hellebuyck on the Filament Friday YouTube channel PERFECTLY LEVEL BED: This tool will give you visual feedback to perfectly adjust the bed level on your 3D printer BATTERY INCLUDED: A CR2032 coin cell battery is included so that your Filament Friday E-Leveler is ready to use right out of the box FULLY ASSEMBLED: The Filament Friday E-Leveler is available in an assembled version