You don't need a fancy balancer as I suspect many modelers never balance their props and just go on flying merrily. I use the Great Plances fingertip prop balancer which costs just $4.29 from Tower Hobbies: part no. LXK427. For advice on how to balance a prop see the tech info at www.masterairscrew.com/ For me the key point is that if your prop balances with a piece of masking tape no more than one inch long, it is a GO to fly. Don't need laboratory accuracy here given that your engine sure as heck isn't in balance.