I use newborn baby scales. I bought mine from Amazon.co.uk so I haven't given you a link being as you are on the wrong side of the pond. Baby scales are well made with no pointy bits or edges and go well in excess of the weight you require. I paid about £40 for mine (about $60) and they weigh in 10 gram increments. They do the job just fine and are very stable will weigh your snake even if it is moving. You can spend a lot more to get them in increments of 5 grams or 2 grams but i find knowing the weight to the nearest 10 grams is fine.