I was wondering what the dimensions of the tester are? The description says 2" x 3" but it doesn't appear that small in the picture. Thank you.

The meter in the picture is, indeed, the GMT-319. It's dimensions are: HEIGHT (5 3/4"), WIDTH (3 3/4"), DEPTH (1 1/2").The dimensions you list in your question, however, are for the GMT 312.And I own both meters.

for voltage measurements, does it need battery to operate?

It shouldn't need a battery for voltage tests. Battery is needed for continuity testing, and resistance testing. This is a theoretical answer. I haven't tried using it without the battery.

if i want to test 110v or 240v , how do i set this meter?

To the right of off is the AC display turn the selector nob to 250v AC then you measure the 110v/240v respectively and don't exceed 250v at that setting

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⚡ Empower Your Electrical Expertise with Gardner Bender!

USER FRIENDLY DESIGN - 20-position rotary dial and zero ohms adjustment dial for effortless calibration and testing.
BUILT IN SAFETY FIRST - Integrated fuse overload protection circuit guards you against electrical mishaps.
COMPREHENSIVE TESTING KIT - Includes replaceable test leads and supports RJ-45 & RJ-11 connectivity for network troubleshooting.
PRECISION AT YOUR FINGERTIPS - Manual range selection with a clear, color-coded analog display ensures accurate readings every time.
VERSATILE MULTI FUNCTIONALITY - Measures DC/AC voltage, current, resistance, and more—perfect for pros and DIYers alike.

The Gardner Bender GMT-319 is a compact, battery-powered analog multimeter featuring 7 functions and 19 measurement ranges up to 1000V. Designed for professionals and hobbyists, it offers a color-coded display, fuse overload protection, and a 20-position rotary dial for precise electrical testing including DC/AC voltage, current, resistance, and continuity. Equipped with replaceable leads and RJ-45/RJ-11 support, it’s your all-in-one tool for troubleshooting electrical circuits and network cables.

Brand	Gardner Bender
Model Number	GMT-319
Product Dimensions	5.08 x 5.08 x 7.62 cm; 0.28 g
Color	ブラック///ホワイト
Name List for Name Plates	7機能/19レンジ。
Material	画像をご参照ください。
Power Source	バッテリー式
Included Components	Gardner Bender GMT-319 マルチメーターテスター、RJ-45 & RJ-11、19レンジ。
Are Batteries Included	No
Battery Type	Alkaline
Item Weight	0.28 g

Gardner Bender GMT-319 マルチメーターテスター RJ-45 & RJ-11 7機能/19レンジ1000V ブラック

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