So I have 20 wild-caught birds that are being used in a series of lab experiments involving stress hormones, feeding rates, and whatever else my boss can think of. We want to be able to monitor each birds' weight without having to handle them, which induces unwanted stress. So it would be nice to have some sort of scale attached to a perch, perhaps hanging down from the top of the cage, that could be used to log a bird's mass. So I'm looking for some means of building 20 simple scales that can give a voltage or resistance output that corresponds to the weight of the bird on the scale. I have the software and interfacing equipment for translating resistance or voltage into weights. All I need are sensors. The birds weigh only 70 to 100 grams, and the perch would probably add another 100 grams. I need accuracy to 1 or 2 grams. The size and shspr of the load cell doesn't really matter as long as there is some way to hang a perch from it. I've found some things that are close to fitting the bill, but aren't perfect. I bought a small electronic pocket scale a few months ago for about $20. What sort of load cell might it have.