The EICO Electronic Instrument Co. Inc. Model 566 Is a 1000 ohm per volt, 38 range multimeter. It has been specifically designed for those engineers and servicemen who want a versatile, highly accurate, and stable instrument that is easily read, portable, and rugged enough for hard dally use. This instrument provides a-c and d-c voltage measurement from .1 volt (on the 1 volt scala) to 5000 volts (an Internal high voltage multiplier Is included). It also provides a-c and d-c current measurement from 1ma (on 1ma scale) to 1 ampere. Resistance, output, and decibel ranges bring the total number of useful ranges to 38 • An added feature of this instrument is an internal blocking capacitor that can be switched in when It is desired to measure the output signal voltage or the gain In decibels In circuits where d-c Is present. Easy reading with less probability of error is obtained by the use of a 400µa, 4 1/2 inch meter. The Model 556 Is identical In every respect to the Model 566 with the exception that 1% multiplier resistors are used. The use of 1% resistors allows a maximum error of 3% of full Scale on d-c and 5% on a-c. This model is desirable where more accurate measurements are required, and is designed to meet the standards of laboratories and schools. The accuracy, the wide scope of ranges, and the easy-reading features provided in both these instruments will meet almost every type of measurement requirement encountered in the electronics industry.