I just picked up this very affordable luggage scale off of ebay, makes weighing instruments very easy: Portable Digital Scales Hanging LCD Electronic Scale Postal Weighing Luggage | eBay It takes a CR2032 battery which is not included. I recently bought a sheet of them for my D'Addario tuners so I was set. Edit: Just noticed this auction says it ships from China. Mine came from Staten Island, NY in 3 days. Not sure why the auction changed. I paid $4.79 for mine including shipping.