Bias Pad by Scott Alexander

This is the world's best Add-A-Number Pad! 

Scott Alexander has supervised the construction of this compact device to his exact performing specifications. Refilling the pad is a breeze as you simply stick on a new stack of sticky notes when ready. Just peel off the old and stick on the new. It's that simple. This device is slim, trim and fits easily into any pocket and is always ready to go. The best part is that the spectators do all the work for you. 

The BIAS PAD is definitely the most silent and deadly weapon in the mentalist's arsenal. This unit is a real joy to use and will last a lifetime.