The Dranetz 626A Mainframe provides all system functions, including power and real-time clock, for its plug-ins. The Dranetz 626A has a membrane keyboard. The Dranetz 626A uses any of the Dranetz 626 series plug-in modules. Can be used for measuring, monitoring, recording, and printing disturbances in ac power, dc power, temperature, and humidity, radio frequency, etc. Details for specific measurements can be found in the information on the various plug-in modules.