Robust, rugged, reliable mechanical chart recorders. No power is required, just the right solution for pressure/temperature testing needs. Mechanical chart recorders record temperature and pressure measurements over time using a pen or stylus to mark measurements on a paper chart that moves beneath it at a constant rate. Our 9-inch and 12-inch mechanical chart recorders are low-maintenance instruments, built for rugged conditions and designed for flexibility, with interchangeable pressure and temperature systems that can be installed and calibrated quickly, maximizing your productivity.