| ELB-500 The 500 W Electronic Load Bank is designed to monitor and control the voltage, current, and power of your fuel cell or another DC power source. | CVMpro90-R3 90 Channel Fuel Cell Voltage Monitoring System | GCU - 500 Gas Control Unit Gas Control Units (GCU) are equipped with humidifiers, pressure gauges, flow meters and thermometers - all with digital indication. |