KD Scientific (Holliston, MA) offers the Gemini 88 syringe pump that features two independent pumping channels linked through hardware and software. The pump can infuse simultaneously at different rates, or infuse with one syringe and withdraw with the other. When combined with a valve box, the pump can provide continuous delivery with a range of syringes from 0.5 μl up to 140 ml. The pump has high-pressure capabilities and TTL and RS-232 interfaces for data acquisition and control. The communications ports enable daisy-chaining up to 100 pumps.