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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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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

🔋Tests 14 battery types

🖤Compact sleek black design

₹ 2130

Duties & taxes included

In stock

Sold byAmazon IndiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Never get caught powerless—test smarter, stay charged!

COMPACT PORTABLE - Lightweight 3.5 oz design fits perfectly in your toolkit or drawer.
TRUSTED BY THOUSANDS - 4.6-star rating from over 4,200 pros who rely on it daily.
PRECISION ANALOG METER - Instant, reliable voltage readings for quick battery health checks.
USER FRIENDLY TEST LEADS - Includes easy-to-use leads for safe and accurate testing every time.
UNIVERSAL BATTERY COMPATIBILITY - From tiny button cells to lantern batteries, test them all effortlessly.

The Gardner Bender GBT-500A is a versatile analog battery tester designed to measure voltage across 14 common battery types, from 1.5V button cells to 22.5V photo and lantern batteries. Featuring included test leads and a compact black design, it offers quick, reliable readings trusted by thousands of professionals.

Specifications

ASIN	B000BOBZJ0
Brand Name	Gardner Bender
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (4,244)
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
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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