Can you use this to check water column on propane regulators ,.....10 to 12 inches of water column?

Yes, look at 12 selectable units and you see InH2O, FtH2O, cmH2O. InH20 is probably what you will use. Most natural gas and LP gas work between 2 inches and 10 inches water column(InH20)

can it be "0" before use?

Yes I have zeroed mine before use

What ID silicone tubing, fits the connectors on the top of the device? What size are the two supplied tubes?

I connected the small tubing to the 1/4" NP adapter and slipped 3/8" clear tubing over the threaded portion. The other end of the 3/8" tubing will fit nicely over the nipple on the Noritz.

need to replace a component in our water heater. Manufacturer asked us to obtain a digital manometer with a 7/16" hose. Will this work?

I used 3'8" tubing. My Monometer came with a small 3/16" tubing and a 3/16" tubing to 1/4" NP fitting. 3/8" tubing fits the threaded portion of the 1/4" fitting.

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EHDIS Manometer, Professional Air Pressure Meter, Dual-Port HVAC Digital Manometers Gas Pressure Tester Differential Gauge

Product ID: 164793784

Details

Brand
EHDIS
Item dimensions L x W x H
5.31 x 1.18 x
Material
Rubber
UPC
738920594353
Unit Count
1.0 Count

⚡Ultra-fast 0.5s response time

📏±0.3% FSO accuracy

🔄Dual-port differential measurement

$94.05

Duties & taxes included

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Description

📊 Measure Like a Pro, Lead Like a Boss

SMART DATA MANAGEMENT - Max/min records, data hold, and save functions ensure you never miss critical pressure trends.
LIGHTNING FAST RESPONSE - Get real-time readings in just 0.5 seconds, keeping your workflow smooth and efficient.
VERSATILE UNIT SELECTION - Switch effortlessly among 12 pressure units to match any professional standard or project need.
PRECISION AT YOUR FINGERTIPS - Experience industry-leading ±0.3% accuracy for flawless HVAC and gas pressure diagnostics.
DUAL PORT DIFFERENTIAL MASTERY - Simultaneously measure two pipes for comprehensive system insights—no guesswork, just data.

The EHDIS Manometer is a professional-grade digital air pressure meter designed for HVAC and gas system diagnostics. Featuring dual-port inputs for differential pressure measurement, ultra-fast 0.5-second response, and ±0.3% accuracy, it supports 12 selectable units and advanced data functions like max/min recording and data hold. Compact and reliable, it’s ideal for technicians and managers demanding precision and efficiency in air and gas pressure testing.

Specifications

ASIN	B07L641Q7L
Best Sellers Rank	#12,315 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Manometers
Brand Name	EHDIS
Customer Reviews	4.4 4.4 out of 5 stars (1,372)
Item Dimensions	5.31 x 1.18 x 2.17 inches
Manufacturer	Ehdis
Material Type	Rubber
Part Number	CR410
UPC	738920594353 738920594377
Unit Count	1.0 Count

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