factory-calibrated to a 50 PSI set pressure

with a steady 24V secondary output

For technicians performing HVAC system maintenance

High Pressure Rating: Rated for systems up to 150 psig

05 inch square shafts

Honeywell 30756304-501 Pen Arm 30067439-890 factory-calibrated to a 50 PSIThe Honeywell 30756304 501 Pen Arm is a critical mechanical component engineered specifically for Honeywell DR4500 Truline circular chart recorders. Designed for precision tracking in industrial process monitoring, this replacement pen arm ensures reliable data logging on 12 inch circular charts. As a veteran grade HVACR part, it is constructed to maintain consistent tension and alignment, preventing ink skipping or charting errors during high cycle