CeramPump valveless piston metering pumps from Fluid Metering provide precision fluid control for environmental monitoring, sampling and treatment. The low-current DC motor can be used for extended 12/24-volt battery operation in remote locations. It uses one moving part, a rotating and reciprocating ceramic piston, for pumping and valving functions. The piston and mated liner are made of dimensionally stable, sapphire-hard ceramics that provide long-term, drift-free accuracy of 1 percent or better. The inert fluid path of ceramic and fluorocarbon is suitable for injection of concentrated tracer dyes and water treatment chemicals. 800/223-3388; www.fmipump.com.