this one has option 1 the ultra stable accurate timebase which is a must if youre not going to use an external reference. the stock ones are not very stableI also have one without the opt 1 for 300$ less if you already have an external rubidium source. This unit is fully calibrated and comes with a calibration certificate and sticker
WE BUY OBSOLETE AND EXCESS INVENTORY! This is a used Hewlett Packard (HP) Flatbed Plotter X-Y recorder, model 7015B. This unit is a one-pen x-y recorder that will chart on paper sizes up to 8.5x11 inches and incorporates an electrostatic paper hold down system.
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