The 7100B Strip Chart Recorder uses a wide line of interchangeable plug-ins to complete its recording ability. It has two independent pens and requires two input modules. Chart speeds of the 7100B are: 1 and 2 in./Hr; 0.1, 0.2, 0.5, 1 and 2 in./min.; 0.1, 0.2, 0.5, 1, 2 in./S.