Man, all these neat and tidy benches... There ain't NO WAY I'm showing mine in the current state... It looks like a Taliban warehouse got hit by a tornado...
They are A&D FX-120i. The balance at the far end of the right bench is the same. I think they are a good 'mid-range' balance - much lower cost than some milligram balances, but they use a magnetic force restoration load cell which gives a fast response and reasonable drift performance. Plenty of warm-up time and a steady temperature helps to get the best results, but controlling air movement is key.