i would get a 2 grams / 2000 grams digital one, meaning it goes to 2000 grams in 2-gram steps. that gives you the precision for weighing small pinkies and fuzzies, while also covering adult BPs, and these scales are quite cheap.
oh and, when it comes to snakes, the metric system has taken over, so a scale with the US unit system, meaning lbs and ounces, would be quite useless.