In this household, it's not just the men who go for the power tools. The knitty amoung us go turbo all the time with our tools...and sometimes we don't even need batteries! Like with the handy Yarn Requirments Guide by the fabulous Ann Budd, of Interweave Knits fame. It will help keep your stash at bay and your budget in check because you won't be buying extra yarn for a project. Ann features eight of the most popular designs that are being knitted today and gives you sizes from baby/toddler to adult and multiple gauges from fine to bulky yarns. OH knitty, you say, clapping your needles together! Think of the time you'll save standing in front of the yarn bin at your local store trying to figure that one out! It's portable too -fits right into your bag and has a spill proof protective coating so you're in the clear there.
AND, no batteries or upkeep (happy dance)!
I purchased mine from KnitBits and keep it in my Knit-Share-Go! tote bag from Cafe Press.
I hope you'll keep this tool in mind. Always follow your pattern suggestions for yarn requirements - but, if you're like me, and flying by the seat of your knitting needles and on the move - accurately improvise with The Knitter's Handy Guide to Yarn Requirements.
We can talk turbo another time ;) frrrrrrrrrm