I've read you need an adapter for presta valves. Which adapter did you buy?

None of these "answers" actually answer your question, so I'll just say this: There are similar products to this on Amazon which have auto-select valves which work for both presta and schrader valves. These are only $5-$10 more. You can also but the BV-Smart valve (https://www.amazon.com/gp/product/B07RM6PDZG/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1) to work with this if you still wish to buy this one.

What is the valve core tool used for?

The valve core tool is used to remove or install the core inside the valve stem. Good thing to check tightness if you have a slow leak. Also a great tool for rapidly deflating a tire.

How accurate is it compared to actual tire pressure?

They state that it’s calibrated to be within 1%. However, I have a certified gauge that always shows this AstroAI to be ½ lb low. I have another inexpensive digital guage which is also ½ lb low. Using my third certified gauge as the reference. Eg. If your tires should be filled to 40# then this should be +- .4# so that’s not exactly ½# but it’s pretty close. And it could also be that much over filled. Personally I would call that fairly accurate as long as you know which direction your specific AstroAI Reads (over or under) I use this all the time and I like it. I just over fill by exactly 1/2lb.

Can i use it with manual bike pump?

Im pretty sure you can with adaptors, but why? You will have to manually pump by hand and squeeze the trigger at the same time. You better off just having a tire gauge and do it the normal way. This unit is best use with air compressor.

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🚗 Inflate your confidence, deflate your worries!

BUILT TO LAST - Rugged stainless steel and brass construction for heavy-duty use
SMART POWER SAVING - Auto on/off feature maximizes battery life without hassle
ALL IN ONE EFFICIENCY - Inflate, deflate, and measure pressure with one smart tool
PRECISION THAT PROTECTS - Accurate within 1% for flawless tire pressure every time
UNIVERSAL COMPATIBILITY - Works seamlessly with Schrader valves and standard air compressors

The AstroAI Digital Tire Pressure Gauge is a professional-grade inflator and gauge combo, delivering ultra-precise readings from 3 to 250 PSI with 0.1 PSI resolution. Built with durable brass and stainless steel, it fits both ¼” and ½” NPT compressors and standard Schrader valves. Featuring an all-in-one design with inflation, deflation, and pressure check functions plus an auto power-saving mode, it ensures safer, more efficient tire maintenance for cars, trucks, motorcycles, and more.

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Brand	AstroAI
Material	Brass, Stainless Steel
Item dimensions L x W x H	4.96 x 1.06 x 1.5 inches
Item Weight	0.66 Pounds
UPC	716150376178
Global Trade Identification Number	00716150376178
Manufacturer	AstroAI
Model	250PSI-M
Item Weight	10.6 ounces
Product Dimensions	4.96 x 1.06 x 1.5 inches
Item model number	250PSI-M
Batteries	2 AAA batteries required. (included)
Is Discontinued By Manufacturer	No
Manufacturer Part Number	250PSI-M-1
Safety Rating	Não aplicável

AstroAI Digital Tire Pressure Gauge with Inflator, 3-250 PSI Air Chuck & Compressor Accessories Heavy Duty with Quick Connect Coupler, 0.1 Display Resolution, 1pack

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