The RE347TX is an advanced, automatic meter, designed for use in the laboratory. The RE347TX has four measurement modes, % saturation, ppm, temperature and the uncalibrated raw signal in pA. The instrument may be calibrated in water or air and may be connected to computers or printers via the bi-directional RS232 interface. The FE247 is a compact battery operated portable meter designed for use in the field. The meter has four measurement modes, % saturation, ppm, temperature and the uncalibrated raw signal in pA. Advanced Dissolved Oxygen Meter This advanced Dissolved Oxygen meter from EDT is a robust, automatic instrument, designed to give results that are both accurate and reliable. The meter offers the following features: Mains or battery operated Sealed keypad controls Polarographic cell BOD measurement Direct readout in % saturation or ppm RS232 Interface Automatic temperature compensation Temperature measurement Fast response and recovery rates Robust, splash-proof case