nanoLiter Cool Wave Dispenser by nanoLiter LLC

"For 30 nL to 450 nL droplets, after calibration, dispensing was reliable and reproducible. We used the dispenser for launching droplets into ultrasonically-levitated droplets. With suitable adjustments and by alternating the potential used to launch each droplet, better than 95% of launched droplets struck the target 3 microliter levitated drop. We had no problems with clogging, and could use as little as 10 microliters of stock solution, limiting reactant consumption. For MS work, having a bipolar supply allows either cations or anions to be injected, so we aren't the only ones who benefit from the bipolar supply. While the Dispenser cost a bit more than I would have liked, it worked as promised and better than more expensive piezoelectric dispensers. "