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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Leaton Manometer, Professional Air Pressure Meter, Dual-Port HVAC Digital Manometer Gas Pressure Tester,12 Selectable Units Differential Pressure Gauge, (Included Battery)

Product ID: 460954910

Details

Brand
Leaton
EU Spare Part Availability Duration
3 Years
Item dimensions L x W x H
16 x 8 x 3
Item weight
200 Grams
Material
Plastic Rubber

📊±0.3% FSO Accuracy

⏱️0.5s Fast Response

🌡️-40 to 80°C Wide Temp Range

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Description

📈 Elevate your pressure game—measure smarter, faster, and with confidence!

RUGGED READY - Operates reliably from -40°C to 80°C, perfect for demanding environments and year-round fieldwork.
INSTANT INSIGHTS - Ultra-fast 0.5 second response time means no waiting—get real-time pressure readings when it matters most.
EYE FRIENDLY DISPLAY - Large LCD screen designed to reduce eye strain during extended use, keeping you focused and efficient.
PRECISION YOU CAN TRUST - Achieve lab-grade accuracy with ±0.3% full scale output for flawless HVAC and gas pressure diagnostics.
VERSATILE MEASUREMENT MODES - Switch effortlessly between single-pipe and differential pressure readings across 12 selectable units.

The Leaton Manometer QX-1201 is a professional-grade digital air pressure meter designed for HVAC and gas system diagnostics. Featuring ±0.3% accuracy, a rapid 0.5-second response, and a wide operating temperature range (-40°C to 80°C), it supports both single and differential pressure measurements with 12 selectable units. Its large LCD display minimizes eye fatigue, while included accessories and a protective bag ensure field-ready convenience. Trusted by professionals for precise, reliable pressure testing.

Specifications

ASIN	B07CWQJD6D
Brand Name	Leaton
Customer Reviews	4.4 4.4 out of 5 stars (879)
EU Spare Part Availability Duration	3 Years
Included Components	Owner's Manual 1x manometer 2x Soft Tubes
Item Dimensions	16 x 8 x 3 centimeters
Item Weight	200 Grams
Manufacturer	Leaton
Material Type	Plastic Rubber
Model	QX-1201
Number of Items	1
Part Number	T68
Thread Style	Npt
UPC	663751079864
Unit Count	1 Count

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80194CFA

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In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

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