The Model 1785 manifold pressure test gauge offers several ranges for use with various types of refrigerants, including R-12, R-22, R-502, R-134A and R-410A. The gauges can be permanently mounted in cooling systems or used on portable manifolds. Type CR-1780 is supplied with 350 psi retard scale to accommodate accidental over-pressure. All gauges feature a one piece polycarbonate ring and window. This provides quick, easy access to internal front adjusting screw for resetting the pointer.