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 Range, Black

Product ID: 275566429

Details

Brand
Gardner Bender
Colour
Black
Item weight
0.22 Pounds
Power source
Battery
Style
14 Battery

⚡1.5V to 22.5V voltage range

🔋14 battery types tested

🖤Compact & lightweight design

SAR 64

Duties & taxes included

In stock

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Description

🔋 Power up your battery game—know when to replace, never get caught powerless!

TRUSTED BY THOUSANDS - 4.6-star rating from over 4,000 users proves it’s a must-have tool.
PORTABLE POWER DIAGNOSTIC - Lightweight and compact, perfect for on-the-go pros and DIYers alike.
ANALOG PRECISION AT A GLANCE - Instant voltage readings with easy-to-read analog dial—no digital lag.
EFFORTLESS TESTING WITH LEADS - Includes test leads for quick, reliable contact on any battery size.
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 measure voltage across 14 common battery types, ranging from 1.5V button cells to 22.5V lantern batteries. Featuring included test leads and a clear analog display, it offers quick, reliable diagnostics in a compact, lightweight form factor. Highly rated by thousands, it’s an essential tool for professionals and enthusiasts who demand instant, accurate battery status on the go.

Specifications

ASIN	B000BOBZJ0
ASIN	B000BOBZJ0
Best Sellers Rank	#41,670 in Electronics ( See Top 100 in Electronics ) #52 in Household Battery Testers
Brand Name	Gardner Bender
Color	Black
Country Of Origin	USA
Country of origin	USA
Customer Reviews	4.6 4.6 out of 5 stars (4,109)
Customer reviews	4.6 4.6 out of 5 stars (4,109)
Date First Available	7 August 2012
Department	Unisex-Adult
Global Trade Identification Number	00032076016869
Included Components	Rough Electrical^battery-testers
Is Discontinued By Manufacturer	No
Item Dimensions	38 x 64 x 97 millimeters
Item Type Name	Battery Tester
Item Weight	0.22 Pounds
Item model number	GBT-500A
Manufacturer	Actuant
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
Product Dimensions	3.81 x 6.35 x 9.65 cm; 99.79 g
Specification Met	RoHS
Style Name	14 Battery Range
UPC	032076016869
Unit Count	1 Count

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