What is the dot on top for? How or when does it improve your shot? What's the explanation or physics behind it?

I posted a review exposing this scam product, but Amazon deleted it - they'll probably delete this as well. There is no physics behind it; it simply makes the ball spin fast. If you put the ball in this "alignment" device 10 times, you will get 10 different black lines around the ball. It does not find an "optimum equator" and it will not improve your shot in any way. Those are the facts, but other people may want to give you some "alternative facts."

where do i buy check-go pens

We no longer carry the replacement pens. I googled Pro Active Check and Go pens and up came a company that had the pens for sale.I hope this helps.

What replacement pen do you use?

Use a WASHABLE Crayola marker first to put temporary Center of Gravity spot and Straight line. Remove ball from spinner and use a Fine Tip Sharpie pen to permanently mark the Center Spot and then put the straight line on over the washable line. Let Sharpie marks dry and wash off washable marks. Use the washable marker to do the first marks cause if you use a Sharpie first you'll have messy ball marks. Replacement pens use a Sharpie.

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Technasonic Check-Go Pro Sweet Spot Electronic Golf Ball Liner

Product ID: 8219679

Details

Age Range (Description)
Adult
Brand
ProActive
Color
Bronze
Item Weight
0.65 Pounds
Material
Polyurethane

💡LED indicator for perfect balance

⏱️Finds sweet spot in 30 seconds

⚙️10,000 RPM high-speed gyroscope

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€ 117.15

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Sold byAmazon GERMANYDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🏌️‍♂️ Spin, mark, and conquer your sweet spot like a pro!

INSTANT VISUAL FEEDBACK - LED light signals when your ball is perfectly balanced and ready to mark—no guesswork, just results.
UNIVERSAL COMPATIBILITY - Works seamlessly with all brands of golf balls—your game, upgraded regardless of brand.
HIGH SPEED GYROSCOPIC SPIN - Spin at 10,000 RPM to reveal the exact sweet spot, reducing hooks and slices effortlessly.
PRECISION SWEET SPOT DETECTION - Unlock your golf ball’s true balance equator in just 30 seconds for straighter, longer drives.
BUILT IN ALIGNMENT CUP MARKER - Create custom partial or bold lines with included pen and alignment cup for pro-level precision.

The Technasonic Check-Go Pro Sweet Spot Electronic Golf Ball Liner uses patented 10,000 RPM gyroscopic technology to locate the true balance equator of any golf ball within 30 seconds. By marking this sweet spot with the included pen and alignment cup, golfers can improve drive distance, accuracy, and reduce hooks and slices. Compatible with all golf ball brands, it features an LED indicator for precise marking and comes ready to use with batteries included.

Specifications

ASIN	B000IMDIAY
Age Range Description	Adult
Ball Type	golf ball
Best Sellers Rank	#56,737 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #219 in Golf Club Bag Accessories
Brand Name	ProActive Sports
Color	Bronze
Construction Type	Electronic, Plastic, Ink-based
Customer Reviews	3.7 3.7 out of 5 stars (1,635)
Global Trade Identification Number	00021089000040
Included Components	Check Go Pro, batteries, marker, manual
Item Type Name	Sweet Spot Electronic Golf Ball Liner
Item Weight	0.65 Pounds
Manufacturer	Technasonic
Manufacturer Part Number	DBL006
Material Type	Polyurethane
Model Number	DBL006
Number of Items	1
Size	One Size
Sport Type	Golf
UPC	021089000040
Unit Count	1.0 Count
Warranty Description	90 day return policy

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