The CDH-SD1 TDS and salt meter packs a real-time SD card data logger, which reportedly sets it apart from other conductivity meters. The instrument features a LCD with green light backlighting, automatic calibration (solutions sold separately), RS-232/USB Interface (optional cable), and automatic temperature compensation. Applications range from water conditioning, beverage manufacturing and fish hatcheries to food processing, educational, and other laboratories. Price Starts at $450. OMEGA ENGINEERING INC., Stamford, CT. (800) 872-9436.