Blue gauge has scale below zero, what are the units in this part of scale

Not to be a jerk....but you should hire a professional hvac person. It's for pulling sytem into a vaccum.

Are you able to add a check valve on this?

yes. there is really no need to because the valve stem is so short the gauge holds very little refrigerant

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Yellow Jacket 40331 Red Pressure Gauge with 19110 Quick Coupler

Product ID: 15476245

Details

Brand
Yellow Jacket
Item Weight
8.8 ounces
Item dimensions L x W x H
9.4 x 5.6 x
Material
Metal
Number of Items
1

📏Compact 7.9x5.1x1.4 inch size

🔧Durable 1/8 NPT threaded connection

⏱️Quick coupler for instant attachment

€ 91.43

Duties & taxes included

In stock

Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

€ 91.43

Duties & taxes included

In stock

Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to France.

Secure transaction

Description

🔴 Pressure Perfected: Gauge your success with every quick connect!

COMPACT PORTABLE - Slim, lightweight design fits effortlessly in your primary service bag—always ready when you are.
INSTANT SYSTEM ACCESS - 19110 quick coupler enables rapid, no-fuss pressure checks directly on tanks or systems.
BUILT FOR PROFESSIONALS - Trusted by HVAC/R techs for reliable performance holding up to 450 PSI without leaks.
UNIVERSAL COMPATIBILITY - PSIG scale works with all refrigerants when paired with P/T charts—master your craft without limits.
PRECISION PRESSURE READINGS - Clear red pressure scale with glass face ensures accurate diagnostics every time.

The 40331 Red Pressure Gauge with 19110 Quick Coupler is a compact, durable tool designed for fast and accurate pressure checks in HVAC/R and refrigeration systems. Featuring a quick coupler for seamless attachment, a clear red pressure dial, and a robust 1/8 NPT threaded connection, it delivers reliable readings up to 450 PSI. Its portable size fits easily into service bags, making it an essential gauge for professionals who demand efficiency and precision on every job.

Specifications

ASIN	B009AXFNFU
Best Sellers Rank	#320,507 in Automotive ( See Top 100 in Automotive ) #156 in Automotive Gauge Sets
Brand Name	Yellow Jacket
Customer Reviews	4.4 4.4 out of 5 stars (176)
Global Trade Identification Number	00686800403311
Item Dimensions	9.4 x 5.6 x 1.4 inches
Item Weight	8.8 ounces
Manufacturer	Fotronic Corporation
Material Type	Metal
Model	40331
Number of Items	1
Number of Packs	1
Part Number	40331
Thread Style	1/8 Npt
UPC	686800403311
Unit Count	1 Count

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