DIGITAL MULTIMETERS - models 1906, 1705 and 1604 1906 - 5.5 Digit LED Bench Multimeter 5½ digits (±210,000 counts), auto/manual range 1µV, 1nA, 1mOhm resolution, 0.012% accuracy Wide range of computing functions included Automatic data logging functions included Integral True RMS AC converter Isolated addressable RS232 interface standard Model with GPIB (IEEE-488) interface available 1705 - Dual Measurement LCD Bench Multimeter 4¼ digit dual LCD Dual 12,000 count, auto/manual ranging Accuracy and resolution: 0.04%, 10µV, 10mW Dual displays & ‘dual measurement’ technology True RMS ac functions, Frequ., Capacitance Wide range of computing functions e.g. Ax + B RS232 interface standard, GPIB optional Mains and battery operation as standard 1604 - 40,000 Count LED Bench Multimeter 40,000 counts, auto/manual ranging Accuracy and resolution, 0.08%, 10µV, 10mW Large and bright LED display (14mm/0.56") True RMS ac functions, wide ac bandwidth Frequency measurement Relative, T-Hold and Min-Max functions included Isolated RS232 interface standard