If you need a way to know what takes and scenes work when you are editing, you need a clapboard. A clapboard helps in the editing room a lot by taking time off editing. Most the time, proffesional clapboards cost in the $100+ range. This is a simple, cheap, and effective clapboard that can help out a lot with your next production.
Step 1: Materials
Small Dry-Erase Board ( I got mine at Dollar Tree)
Dry Erase Marker (mine came with the board)