will it test a 3 volt button battery?

It can do 1.3-1.5 button cell only. It does have two nodes on the front that are for Lithium 3 volt batteries but it doesn't say "button" type. You charge the 1.5 size button by slipping into a slot on the right side of the charger and pressing that red button you see on the front.

Does the Battery Tester use an internal battery that must periodically be replaced?

No it does not use an internal battery, the meter gets its power from the battery being tested, the better the battery the stronger the test reading. The main purpose of this meter is to give you a general idea of remaining battery life.

Will this test 9volt batteries

Yes. It has 9 test positions, as follows: Button Cell & Zinc Air 1.3V -1.5V, AAA-N & Ni-Cad 1.5V, AA-C-D 1.5V, 22.5V, 15V, 12V, 9V, Photo 6V, Lithium 3V

As per Amazon site: This item is non-returnable

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Gardner Bender GBT-500A Analog 1.5 V Button Cell/22.5 Photo/AA/AAA/12 V/9 V/Lantern Cells & More, Leads Battery Tester,14 Battery Range, Black

Product ID: 4721361

Details

Brand
Gardner Bender
Color
Black
Item Weight
3.52 ounces
Power Source
Battery
Style
14 Battery

⚡Voltage range 1.5V to 22.5V

📏Compact 1.5x2.5x3.8 in

🔋Tests 14 battery types

$U1007

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Description

🔋 Keep your power in check—because dead batteries are so last season!

TRUSTED BY THOUSANDS - 4.6-star rating from over 4,200 users proves reliability you can count on.
LIGHTWEIGHT PORTABLE - Weighing only 3.5 oz, it’s perfect for on-the-go pros and home tech troubleshooters.
INTUITIVE ANALOG DISPLAY - No confusing screens—just a clear, easy-to-read meter for instant results.
SIMPLE NO NONSENSE OPERATION - Forget manuals—plug in, test, and know if your battery’s good or needs replacing.
UNIVERSAL BATTERY COMPATIBILITY - From tiny button cells to lantern batteries, test them all with one device.

The Gardner Bender GBT-500A is a versatile analog battery tester designed to quickly assess the charge status of 14 common battery types, ranging from 1.5V button cells to 22.5V lantern batteries. Its compact, lightweight design and straightforward analog meter make it an essential tool for professionals and home users alike who demand reliable, no-fuss battery testing.

Specifications

ASIN	B000BOBZJ0
Brand Name	Gardner Bender
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (4,249)
Global Trade Identification Number	00032076016869
Included Components	Rough Electrical^battery-testers
Item Dimensions	1.5 x 2.5 x 3.8 inches
Item Type Name	Battery Tester
Item Weight	3.52 ounces
Manufacturer	Actuant
Measurement Type	Voltmeter
Minimum Operating Voltage	1.5 volts
Model	GBT-500A
Number of Items	1
Part Number	GBT-500A
Power Source	Battery Powered
Style Name	14 Battery Range
UPC	032076016869
Unit Count	1 Count
Warranty Description	Warranty

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$U1007

Duties & taxes included

In stock

Sold byAmazon UruguayDelivered 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 Uruguay.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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