Does this clip on to the valve with an air tight seal then press the button to leak air to set pressure?

it doesn't 'clip' on you have to push it on and keep pressure on it but it is air tight and yes just press the button to release pressure.

Is it accurate at low pressures, ie 0 to 20 psi?

I use this on my road bikes (100PSI) and mountain bikes (20 PSI and 30PSI) it certainly appears to be accurate at these pressures, so I'd be surprised if was horribly inaccurate at pressures below 20PSI.

Can I use this for my car?

Yes, it works on a car, no problem. It fits either Schrader (car type) or Presta (cycle type) valves. Thanks

My topeak gauge on my bike tyre reads 70 even though I know it should read around 30 as per my track pump? How can I reset it?

I don't know for sure, but popping out the battery for a few seconds usually helps with many electronics. Maybe it needs a new battery.

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Topeak Smart D2 Digital Gauge

Product ID: 49566888

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

💡Customizable LCD units: psi, Bar, kg/cm²

📊Precision reads up to 250 psi / 17 bar

🔄Rotating SmartHead fits all valves

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11961 som

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Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚴‍♂️ Pump up your ride with precision and style!

COMPACT LIGHTWEIGHT - Weighs just 65g and fits perfectly in your wheel bag for on-the-go tuning.
ROTATING SMART HEAD DESIGN - Ergonomic swivel head ensures easy, leak-free connection every time.
CUSTOMIZABLE DISPLAY UNITS - Switch effortlessly between psi, Bar, or kg/cm² to suit your preference.
UNIVERSAL VALVE COMPATIBILITY - Seamlessly works with Presta & Schrader valves—no extra parts needed.
HIGH PRECISION PRESSURE READINGS - Accurately measures up to 250 psi / 17 bar for tires, forks, and shocks.

The Topeak Smart D2 Digital Gauge is a compact, lightweight, and highly accurate pressure gauge designed for cyclists who demand precision. Featuring a rotating SmartHead compatible with both Presta and Schrader valves, it reads pressures up to 250 psi / 17 bar and offers a customizable LCD display with multiple unit options. Ideal for tires, suspension forks, and rear shocks, this tool is a must-have for professionals and enthusiasts aiming for perfect pressure every ride.

Specifications

ASIN	B0051LQ0X4
Best Sellers Rank	3,393 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 13 in Hand Tools (Sports & Outdoors)
Brand	Topeak
Customer Reviews	4.5 4.5 out of 5 stars (10,726)
Global Trade Identification Number	00883466003323, 04712511824537
Included Components	Gauge
Item Dimensions	10.4 x 4.5 x 3.5 centimetres
Item Type Name	Precision Digital Gauge
Item Weight	65 Grams
Manufacturer	Topeak
Manufacturer Part Number	TSG-02
Material	Plastic
Model Number	60100005
UPC	883466003323
Unit Count	1.0 count

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