Will this work on Presta and Shrader valves?

Yes. The yellow slider on top has both Shrader and Presta positions. It's easy to slip on and off without losing a significant amount of air, and the readout is very visible. The head swivels to make the gauge fit comfortably in your hand no matter what the angle of the valve. I've had this gauge for a year and definitely recommend.

How does the air release reading work on this?! i press the release button and air is escaping but the psi doesn't lower on the readout.

You have to be in the correct mode for this. After first reading the pressure, press the button with the circle on it labeled "tune" then use the yellow air release button to let out air and the unit will automatically read the new pressure.

Does this work correctly with presta valves? i know the description says so, but other gauges also claim that and do not perform well with them

Yes, it works with presta valves. There is a setting for presta and a setting for schrader. Testing on a presta requires you to quickly get the guage on the valve.You must also remove the gauge quickly. It would be nice to have a presta guage that worked as easily as the guages do on the scrader valves, but I haven't found one. This guage works fine on both types of valves

Does this gauge read low enough for Fat bikes 4-7 psi?

It does read in the single digits but no decimals. So, if you're looking to fine tune to 1/2 or 1/4 psi increments, it isn't that precise. The Accu-Gage analog units can do that. However, I have one the goes to 15 psi max and reads in 1/4 psi increments and one that goes to 30 psi max, 1/2 psi increments and they read 1 full psi apart from each other. So, perhaps the fractional readings are pointless.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Topeak Smart D2 Digital Gauge - Black

Product ID: 258055648

Details

Brand
Topeak
Item dimensions L x W x H
10.4 x 4.5 x
Item weight
65 Grams
Material
Plastic
Number of Items
1

🎯SmartHead™ fits Presta & Schrader valves seamlessly

🔄Rotating head for versatile valve access

⏱️Instant digital readout up to 250 PSI

Description

🚴‍♂️ Pump Like a Pro, Ride Like a Legend

COMPACT LIGHTWEIGHT - Sleek 10.4 x 4.5 x 3.5 cm design weighing just 65g—carry professional-grade accuracy wherever you roll.
ERGONOMIC ROTATING HEAD - 360° swivel design ensures easy access in tight spots—comfort meets efficiency every ride.
INSTANT DIGITAL READOUT - Clear, backlit display shows PSI, Bar, and kg/cm² for quick, precise readings—stay ahead of the curve.
PRECISION PRESSURE MASTERY - Accurately measures up to 250 PSI for tires, forks, and shocks—never second guess your pressure again.
UNIVERSAL VALVE COMPATIBILITY - SmartHead™ connector effortlessly adapts to both Presta and Schrader valves—no fiddling, just pump and go.

The Topeak Smart D2 Digital Gauge is a compact, precision instrument designed for cyclists and outdoor enthusiasts who demand accurate tire, fork, and shock pressure readings up to 250 PSI. Featuring a SmartHead™ connector compatible with both Presta and Schrader valves, a rotating head for versatile use, and a clear digital display offering multiple pressure units, this lightweight gauge ensures effortless, professional-grade inflation on the go.

Specifications

ASIN	B0051LQ0X4
Best Sellers Rank	#35,394 in Sporting Goods ( See Top 100 in Sporting Goods ) #107 in Bike Shop Tools
Brand Name	Topeak
Customer Reviews	4.5 4.5 out of 5 stars (10,857)
Global Trade Identification Number	00883466003323, 04712511824537
Included Components	Gauge
Item Dimensions	10.4 x 4.5 x 3.5 centimeters
Item Type Name	Precision Digital Gauge
Item Weight	65 Grams
Manufacturer	Topeak
Material Type	Plastic
Model	60100005
Number of Items	1
Number of Packs	1
Part Number	TSG-02
UPC	883466003323
Unit Count	1 Count
Warranty Description	2 Year Manufacturer

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