The Hongsen HS-536A is a professional-grade manifold gauge set designed for accurate servicing of refrigeration and air conditioning systems. Compatible with multiple refrigerants—including R22, R134a, R404A, and R407C—this tool is ideal for HVAC technicians performing installation, maintenance, and diagnostics.​ https://www.industrywaala.com/product/hongsen-taa0644-hs-536a-manifold-gauge-set