This is a Value VMG-1-U-L Single Manifold Gauge, a professional tool used by technicians to test, evacuate, and charge air conditioning and refrigeration systems.It has a blue protective cover: Wrapped in a rugged, shock-resistant blue rubber boot for durability.Large Dial Face: Features an easy-to-read 68mm dial displaying pressure scales in psi and bar, along with temperature scales for multiple refrigerants (R22, R134a, R407C, R410A).