The Mastercool MRBL1 is a Class 1.0, 80 mm low-side replacement gauge with multi-refrigerant scales for R22/R404A/R407F/R134a. Built with anti-flutter to steady the pointer, it gives clean, repeatable readings so you can charge and diagnose without the guesswork — fair dinkum handy when time’s tight.

Key features & trade benefits

• Class 1.0 accuracy, 80 mm face — fast, confident LP readings at a glance, even in glare.
• Anti-flutter movement — steadier needle = better charge control and fewer call-backs.
• R22/R404A/R407F/R134a temperature rings (°C) — quick PT checks right on the dial.
• Dual BAR/PSI/kPa scales — log readings in your preferred units across jobs.
• Spare-part gauge only — rapid swap on site to get your manifold back to work.

Why this product matters

Real-world: you’re on a Sydney roof in a nor’easter, customer watching, and your old LP dial’s dancing all over. Drop in the MRBL1 and the pointer settles — no worries about overcharging or misreads. If you’re rebuilding the whole rig, check our Mastercool manifold gauge sets.

Pro tip

Let the gauge equalise to ambient, zero-check, then install carefully. Confirm your manifold’s gauge thread and avoid over-torque — snug is enough to keep the anti-flutter working a treat.

Compatibility & system info

• Refrigerants: R22, R404A, R407F, R134a (LP scales printed on dial).
• Scales: BAR / PSI / kPa with °C saturation rings.
• Fitment: Replacement LP gauge for compatible analogue manifolds (verify thread on your set).

Local note: From humid Brisbane plant rooms to windy Sydney rooftops, the big 80 mm face stays readable — ripper visibility.

What’s included

• 1 × Mastercool MRBL1 80 mm low-side gauge (spare part, face marked for R22/R404A/R407F/R134a).

Specifications

Specs confirmed from the HVAC Shop listing.

Warranty & returns

Backed by HVAC Shop’s standard warranty & returns when installed by licensed technicians. Follow Australian refrigerant-handling and WHS requirements on site.

FAQs

Is it really Class 1?
Yes — MRBL1 is Class 1.0 with BAR/PSI/kPa and °C PT rings for the listed refrigerants.

Will it fit my manifold?
It’s a replacement LP dial for compatible analogue bodies; check your thread and mounting style before ordering.

Is there a matching high-side dial?
Yes — pair with the MRBH1 high-side gauge for consistent faces.

Related products

• 80 mm Gauge Protector Set (91553-EE) — helps prevent lens damage and fogging when the kit slides around the van.
• Mastercool Manifold Gauge Sets — a tidy option if you’re refreshing more than one dial, she’ll be right.
• Matching High-Side Gauge (MRBH1) — keep both sides aligned for clean, readable sets.