I've been looking for a reliable and somewhat precise USB-scale.
• Form factor, square or small puck <100mm to fit in your backpack (not a letter scale)
• preferably with threads for screw mounts
• resolution of 0,1 grams would be enough (calibrated)
• documented "API" to stream data at minimum 1kHz
• communication preferably via USB, but EtherCat or RS-232 could be ok too (more common in industrial gear..)