Wouldn't the 2psi version do everything this one does and more? They both have 0.001psi resolution.

If all you care about is 0.001 psi resolution, then you should be fine with the 2psi version. However, the 0.5psi version does have better resolution, as can clearly be seen in the spec sheet, ie, 0.01mmHg vs 0.1mmHg. So it just depends on your application, but it would be a pretty rare application that requires better resolution that 0.001psi.

Is it intrinicly safe for testing natural gas pressure?

No moving parts, and a sealed assembly would lead me to say yes.

This includes nist-traceable calibration certificate?

This does not come with the NIST traceable certificate. The Extech part number HD750-NIST will include the cert.

How many decimal places does this unit display to the right of the decimal when using "in wc"?

Two. It reads in hundredths of inches water column. It's probably not that accurate, but it displays them.

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BUILT TO LAST - Heavy-duty, double-molded housing ensures durability in demanding conditions.
USER FRIENDLY DESIGN - Large LCD display with backlighting for easy reading in any environment.
SMART DATA MANAGEMENT - Max/Min/Avg recording with relative timestamps for comprehensive analysis.
PRECISION AT YOUR FINGERTIPS - Experience a 0.5 PSI range for accurate measurements.
VERSATILE MEASUREMENT OPTIONS - Choose from 11 selectable units to suit your needs.

The Extech HD755 0.5 PSI Manometer and Pressure Meter is a robust and versatile tool designed for professionals. With a measurement range of 0.5 PSI and 11 selectable units, it offers precise data recording capabilities, including Max/Min/Avg functions with timestamps. The large backlit LCD display enhances visibility, while the heavy-duty housing ensures longevity, making it an essential device for any serious technician.

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Manufacturer	Extech
Part number	HD755
Item Weight	280 g
Product Dimensions	7.37 x 4.83 x 20.83 cm; 280 g
Batteries	2 Lithium Ion batteries required. (included)
Item model number	HD755
Material	Polycarbonate (PC)
Item Package Quantity	1
Number of Pieces	1
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline

ExtechHD755 0.5 PSI Manometer and Pressure Meter

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