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

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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

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

€ 26.11

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Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Keep your power game strong—know your battery’s health at a glance!

COMPACT PORTABLE - Fits in your toolkit or drawer effortlessly, ready to diagnose power anytime, anywhere.
TRUSTED BY THOUSANDS - 4.6-star rating from over 4,200 users proves it’s the go-to tester for pros and home managers alike.
INTUITIVE ANALOG DISPLAY - No confusing screens—just a clear, easy-to-read meter for instant battery health insights.
DURABLE TEST LEADS INCLUDED - Reliable leads ensure accurate readings without the hassle of replacements or repairs.
UNIVERSAL BATTERY COMPATIBILITY - From tiny button cells to lantern batteries, test them all with one sleek device.

The Gardner Bender GBT-500A is a versatile analog battery tester designed to measure voltage from 1.5V button cells up to 22.5V lantern batteries. Featuring a straightforward analog meter and included test leads, it offers quick, reliable testing for 14 common battery types. Compact and durable, it’s highly rated by thousands for its simplicity and accuracy, making it an essential tool for professionals and home users who demand dependable battery diagnostics without the tech overload.

Specifications

ASIN	B000BOBZJ0
Brand	Gardner Bender
Brand Name	Gardner Bender
Color	Black
Customer Reviews	4.6 out of 5 stars 4,256 Reviews
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
Item dimensions L x W x H	1.5 x 2.5 x 3.8 inches
Manufacturer	Actuant
Measurement Type	Voltmeter
Minimum Operating Voltage	1.5 Volts
Model	GBT-500A
Part Number	GBT-500A
Power Source	Battery Powered
Style	14 Battery Range
Style Name	14 Battery Range
UPC	032076016869
Unit Count	1.0 Count
Warranty Description	Warranty

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€ 26.11

Duties & taxes included

In stock

Sold byAmazon FinlandDelivered 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 Finland.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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