The 3421A Data Acquisition/Control Unit is the system that beats the high cost of data logging. Use it for that small data acquisition project with the assurance that it will quickly pay its own way. Scans up to 30 channels, measuring DCV, ACV, 2- and 4-wire Ohms, Frequency, and Temperature. It also reads and writes digital information and stores up to 30 analog readings. With its 5 1/2, 4 1/2, 3 1/2 digit A/D converter, the 3421A can resolve 1 µV out of 300 mV to monitor thermocouples, strain gage bridges, and other low-level transducers. Or it can read higher level signals by auto-ranging up to 300 VDC! Also features electronic calibration, rechargeable battery, high level command set and accepts up to three other assemblies (sold separately): 10 Channel multiplexer/actuator assembly, 8-bit input/8-bit output digital assembly, breadboard assembly.