The Mastercool MRBH1 is a Class 1.0, 80 mm high-side replacement gauge with multi-refrigerant scales for R22/R404A/R407F/R134a. Built with anti-flutter to steady the pointer, it delivers fast, reliable readings on charge and test — a bloody good swap when an old dial cops a knock.

Key features & trade benefits

• Class 1.0 accuracy, 80 mm dial — confident high-pressure readings at a glance, even in glare.
• Anti-flutter movement — steadier needle = less guesswork and fewer call-backs.
• R22/R404A/R407F/R134a temperature scales — quick PT checks right on the face to speed diagnostics.
• Dual BAR/PSI/kPa units — read it your way and keep notes consistent across jobs.
• Spare-part gauge only — drop-in replacement so you’re back on the tools in minutes.

Why this product matters

Real world: up on a 40-degree roof, the old HP dial’s fluttering like mad. You swap in the MRBH1 and the pointer settles immediately — no worries about over-charge or wild readings. If you’re refreshing more than one face, see our Mastercool manifold gauge sets to rebuild the whole rig cleanly.

Pro tip

Let the gauge equalise to ambient temp before zero-check. When installing into your manifold, confirm the body thread (many analogue manifolds use 1/8″ NPT back mount) and avoid over-torque — a snug fit keeps the anti-flutter doing its job.

Compatibility & system info

• Refrigerants: R22, R404A, R407F, R134a (scales printed on dial).
• Scale units: BAR / PSI / kPa with °C temperature rings.
• Mounting: Replacement gauge for compatible analogue manifolds (check thread/fit on your set).

Local note: From windy Sydney rooftops to steamy Brisbane plant rooms, the big 80 mm face keeps readings clear — she’ll be right.

What’s included

• 1 × Mastercool MRBH1 80 mm high-side gauge (spare part, face marked for R22/R404A/R407F/R134a).

Specifications

Specs verified against HVAC Shop listing and Mastercool model page.

Warranty & returns

Covered by HVAC Shop’s standard warranty & returns for products installed by licensed technicians. Always follow Australian refrigerant-handling and WHS requirements.

FAQs

Is the MRBH1 suitable for automotive R134a as well as commercial R404A?
Yes — the face includes R134a and R404A temperature scales alongside R22 and R407F.

Does it include fittings or a boot?
No — it’s a spare gauge only. Add a protector boot for better impact resistance.

I need a matching low-side gauge.
Pair it with the MRBL1 low-side gauge for consistent faces.

Related products

• 80 mm Gauge Protector Set (91553-EE) — helpful to prevent lens damage and fogging on site.
• Mastercool Manifold Gauge Sets — the easy path if you’re refreshing multiple dials.
• EBL1 Low-Side Gauge (R410A/R32/R22/R407C) — handy if you want modern HFC scales on LP too.