can the units be switched from psi to "WC?

Yes I used mine for measuring LP gas pressures.

What is the thread size of the barb metal connector - 1/4 in. or 3/8 in?

The hose Barbs appears to be molded into the housing, for the supplied 1/8" ID dia hose.

why are there 2 connector ports?

Second port is for measuring differential pressure, not needed if only reading pressure, and there is a positive and negative.

Why does it read -.018"H2O without even taking the measurement? That would be quite an error.

Because it hasn’t been “zero’d” yet.

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Digital Manometer, Dual-Port HVAC Gas Pressure Tester, Differential Gauge

Product ID: 69972515

Details

Brand
Leaton
Item Weight
200 g
Item dimensions L x W x H
6.3 x 3.15 x
Material
Acrylonitrile

⚡0.5s fast response

💡Large backlit LCD

📊±0.3% accuracy

$93.51

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📈 Elevate your HVAC game with precision and clarity—don’t get left behind!

BUILT TO LAST - Durable ABS casing resists high temps and impacts for long-term reliability.
SMART DATA HANDLING - Store and recall measurements easily with built-in memory and low battery alerts.
DUAL PORT VERSATILITY - Measure single or differential air pressure seamlessly with dual ports.
CRYSTAL CLEAR READINGS - 4.95x4.45cm backlit LCD reduces eye strain during late-night troubleshooting.
PRECISION YOU CAN TRUST - Achieve ±0.3% FSO accuracy for flawless HVAC diagnostics.

The Leaton QX-1201 Digital Manometer is a professional-grade dual-port air pressure meter designed for HVAC, gas systems, and lab use. Featuring ±0.3% accuracy, a large backlit LCD, and rapid 0.5-second response time, it ensures precise and clear measurements. Its rugged ABS build withstands harsh conditions, while smart storage and low battery alerts keep your workflow uninterrupted. Ideal for technicians demanding reliability and efficiency.

Specifications

ASIN	B07CWQJD6D
Best Sellers Rank	#8,999 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Manometers
Brand	Leaton
Brand Name	Leaton
Customer Reviews	4.4 out of 5 stars 925 Reviews
Included Components	Owner's Manual 1x manometer 2x Soft Tubes
Item Dimensions	6.3 x 3.15 x 1.18 inches
Item Highlight	±2.999 psi Range, ±0.3% FSO Accuracy, 12 Units, Backlit LCD, Static Pressure, for HVAC Techs and DIY
Item Weight	200 g
Item dimensions L x W x H	6.3 x 3.15 x 1.18 inches
Manufacturer	Dongguan Qixin Electronic Technology Co., Ltd
Material	Acrylonitrile Butadiene Styrene (ABS)
Material Type	Acrylonitrile Butadiene Styrene (ABS)
Model	QX-1201
Number of Items	1
Number of Packs	1
Part Number	T68
Thread Style	Npt
UPC	663751079864
Voltage	9 volts

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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$93.51

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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