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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Topeak SmartGauge D2 Digital Tire Pressure Gauge – Presta/Schrader Compatible, 250 Psi/17 Bar, Precision Air Pressure Reader with LCD Display for Bikes, Motorcycles & Sports Equipment | bike-hand-tools

Product ID: 3505714

Details

Brand
Topeak
Item Weight
65 Grams
Item dimensions L x W x H
4.09 x 1.77 x
Material
Plastic
Number of Items
1

📏Precision up to 250 PSI / 17 Bar

📱Clear LCD display with multi-unit readout

🔄Dual-valve SmartHead compatibility

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Description

🚴‍♂️ Pump up your ride with precision and style!

PRO LEVEL ACCURACY 📏 - Measures up to 250 PSI/17 Bar for precise tuning of tires, shocks, and suspension.
CRYSTAL CLEAR READINGS 📱 - Easy-to-read LCD screen with switchable units (psi, Bar, kg/cm²) for versatile use.
SEAMLESS VALVE SWITCHING 🔄 - Rotating SmartHead fits Presta & Schrader valves—ditch adapters and save time.
EFFORTLESS PRESSURE CONTROL 🎯 - 360° rotating head plus air release button lets you fine-tune pressure like a pro.
LIGHTWEIGHT TRAVEL READY 🏞️ - Compact 65g design fits perfectly in your toolkit or backpack without weighing you down.

The Topeak SmartGauge D2 is a compact, durable digital tire pressure gauge featuring a rotating SmartHead compatible with both Presta and Schrader valves. It delivers professional-grade accuracy up to 250 PSI/17 Bar, with a clear LCD display offering multiple unit options. Lightweight and user-friendly, it’s perfect for cyclists, motorcyclists, and sports enthusiasts who demand precise air pressure control on the go.

Specifications

ASIN	B0051LQ0X4
Best Sellers Rank	#9,752 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #15 in Bike Shop Tools
Brand Name	Topeak
Customer Reviews	4.5 4.5 out of 5 stars (11,146)
Global Trade Identification Number	00883466003323, 04712511824537
Included Components	Gauge
Item Dimensions	4.09 x 1.77 x 1.38 inches
Item Type Name	Shop Tools
Item Weight	65 Grams
Manufacturer	Topeak
Material Type	Plastic
Model	60100005
Part Number	TSG-02
UPC	883466003323
Unit Count	1.0 Count
Warranty Description	2 Year Manufacturer

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C$4599

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In stock

Sold byAmazon NicaraguaDelivered 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 Nicaragua.

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