De Wit 4888SS dual-pen pressure chart recorder. Mechanical spring wound clock, rev.time 24hrs (clockwise). Accuracy cl. 1,0 (+/- 1% of full scale). 0-10,000psi (200psi graduation), 0-20,000psi (400psi graduation). Recording with disposable felt pen on 8" circular recorder charts, writing width 80mm. Connection bottom or rear, 1/2"NPT male or 1/2"BSP male.