Does this unit hold and seal the tire stem well? The clamp looks the cheap one that doesn't stay on the valve stem.

Put on correctly, it seals and will hold air...it is not a cheap fitting. I have used mine to check tire pressure even without an air hose hooked up when I was just checking.

can the air chuck be replaced by a dual one, and if so what model

Yes, the black air hose that is attached to this unit has 1/4" NPT on both ends and fits standard accessories. It appears that any of the Milton dual head air chucks will fit as they are furnished with female 1/4" NPT.

Can this gage be used with the air hoses you find at many gas stations?

Everyone else has given you the common answer, which is no. But if you're a traveler, and you wanted to use this at gas stations, then you could add this: http://www.amazon.com/Amflo-701-2-npt-tank-valve/dp/B0002V4Q4I/ref=sr_1_8?ie=UTF8&qid=1410808589&sr=8-8&keywords=schrader+valve+adapter Then clip the gauge hose on your tire, and hold the station hose on the end of the gauge and that would work. Although maybe not real comfortable to do.

What batteries does it use? Charlie

4-24-16 The one I received today IS the updated version with the steel mesh hose and 2 AAA batteries. Also, simplified battery installation/replacement procedure. Simply peel back the rubber cover, pry open battery compartment door, install batteries, replace compartment door and re-seat rubber cover.

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🚗 Inflate with confidence, measure with precision — never miss a beat on the road!

BUILT TO LAST - 21-inch stainless steel braided hose resists wear and tear on every adventure.
USER FRIENDLY DESIGN - Large backlit LCD and rubber sleeve provide comfort and clarity in any condition.
POWER THROUGH YOUR DAY - Dual AAA batteries deliver 4X longer life for uninterrupted performance.
PRECISION YOU CAN TRUST - 0.1 PSI resolution ensures flawless accuracy for TPMS compliance.
VERSATILE MEASUREMENT MODES - Switch effortlessly between PSI, BAR, and KG units to suit your needs.

The Astro Pneumatic AST3018 Digital Tire Inflator features a durable 21-inch stainless steel braided hose and a dual AAA battery system that offers 4X the battery life. It provides ultra-precise pressure readings with 0.1 PSI resolution, compatible with TPMS, and displays measurements in PSI, BAR, or KG. Designed for durability and ease of use, it includes a large backlit LCD and a protective rubber sleeve, making it an essential tool for professional-grade tire maintenance.

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Brand	AP Astro Pneumatic Tool Company
Material	Stainless Steel
Item dimensions L x W x H	29.2 x 14 x 10.6 Centimeters
Item Weight	1.8 Pounds
UPC	745227013296
Global Trade Identification Number	00745227013296
Manufacturer	Drake Off Road Tools
Product Dimensions	29.21 x 14 x 10.59 cm; 816.47 g
Batteries	2 AAA batteries required.
Item model number	3018
Manufacturer Part Number	3018
Country of Origin	USA
Item Weight	816 g

Astro Pneumatic (AST3018) 3.5" Digital Tire Inflator with Hose

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