JB Industries
JB Industries M2-820 Low Side Gauge Blue Glow-in-the-Dark 500 psi
Low-side HVAC gauge with blue glow-in-the-dark face reads 30 in Hg to 500 psi for R-22, R-404A and R-410A systems
- ColorBlue, Glow-in-the-Dark
- Low-side pressure reading up to 500 psi for R-22, R-404A, R-410A systems
- Glow-in-the-dark blue dial stays readable in dim work areas
- 3-2-3 % accuracy class supports precise refrigerant charging
- 1/8 in connection fits standard manifold gauge sets
- Vacuum scale to 30 in Hg covers evacuation and recovery tasks
Low-Side Gauge for HVAC Manifolds
The JB Industries M2-820 is a low-side pressure gauge designed for HVAC manifold sets. Its blue glow-in-the-dark face allows clear readings in dim conditions. Technicians working with R-22, R-404A or R-410A refrigerants can use it for system diagnostics and charging. The gauge covers a working range from 30 in Hg vacuum up to 500 psi.
Replaces Worn or Damaged Manifold Gauges
Swap this in when an existing low-side gauge shows drift, a cracked lens or a stuck needle. The +/-3-2-3 percent accuracy class restores reliable suction-pressure readings for the listed refrigerants. If the manifold body remains sound, changing only the gauge saves the cost of a full set replacement. It is not suited for high-side pressure measurement or refrigerants outside the three specified types.
Simple Thread-On Installation
The 1/8 in connection threads directly onto compatible manifold ports with standard pipe sealant. Apply sealant sparingly to avoid contaminating the refrigerant circuit and tighten to a firm seat without forcing the brass fitting. Over-tightening can crack the gauge body or strip the manifold port threads. Verify zero reading before pressurising the system to confirm a leak-free seal.
Highlights
- Low-side pressure reading up to 500 psi for R-22, R-404A, R-410A systems
- Glow-in-the-dark blue dial stays readable in dim work areas
- 3-2-3 % accuracy class supports precise refrigerant charging
- 1/8 in connection fits standard manifold gauge sets
- Vacuum scale to 30 in Hg covers evacuation and recovery tasks
Specifications
| Brand | JB INDUSTRIES |
|---|---|
| Color | Blue, Glow-in-the-Dark |
Questions about this item
What connection size does the M2-820 low-side gauge need to thread onto a manifold block?
The gauge uses a 1/8 in connection that threads directly into the manifold gauge port.
How do I install the M2-820 gauge without damaging the threads or causing a leak?
Apply refrigerant-compatible thread sealant to the 1/8 in fitting, hand-tighten the gauge into the manifold block, then snug with a wrench without over-torquing the brass threads.
When should the M2-820 gauge be replaced to keep readings within the stated accuracy?
Replace the gauge if the needle no longer returns to zero at atmospheric pressure or if readings drift beyond the +/-3-2-3 percent tolerance during system checks.
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