JB Industries M2-890 3-1/8" liquid filled compound gauge for R-22/404a-410a

• Internal "breathing diaphragm" eliminates air bubbles
• No calibration needed
• Highly accurate to 1%
• Temperature compensated for changes in case pressure for accuracy
• 1/8" MPT fitting
• Tough, impact-resistant Zytel casing with over 10,000 pound tensile strength