I use triple beams because of my kbird. They have to be rezeroed everytime you move them - my desk at work was always different than my desk at home - was not on zero. A nickle will weigh 5 grams to check the accuracy. You have to have a flat surface to put them on - car hood does not work. I recommend if you end up getting a set to make a box to carry them in and be able to weigh on in the field. They can be a pain to work with. On the dial o gram if this little piece of rubber by the dial gets hit it will move. And then everything is off again. GET A BOX TOO. My 02
Kim Mauldin
"Believe"
Marian & Bob Bailey