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

Gmt 319 | Desertcart Czech Republic

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Description

⚡ Power Your Projects with Precision and Confidence!

SAFETY MEETS DURABILITY - Fuse overload protection and agency approval keep you and your device secure during heavy-duty diagnostics.
PRECISION AT YOUR FINGERTIPS - 19 selectable ranges via a smooth rotary dial for pinpoint troubleshooting accuracy.
INSTANT CONTINUITY CONFIRMATION - Built-in buzzer alerts you under 100 Ohms—no more squinting at the dial.
PARALLAX REDUCED ANALOG DISPLAY - Color-coded dial with mirror scale ensures error-free readings every time.
VERSATILE 7 IN 1 TESTING POWERHOUSE - Master AC/DC voltage, current, resistance, continuity, decibels & battery checks with one pro-grade tool.

The Gardner Bender GMT-319 is a professional-grade analog multimeter designed for homeowners, hobbyists, and pros. It offers 7 essential electrical testing functions across 19 ranges, including AC/DC voltage up to 1000V, DC current, resistance, continuity with audible buzzer, decibel measurement, and battery testing. Featuring a color-coded analog display with parallax reduction, zero ohms adjustment, replaceable leads, and built-in fuse protection, this compact, durable tester ensures accurate diagnostics and safe operation for a wide range of electrical troubleshooting tasks.

Specifications

ASIN	B0002YUN4C
Best Sellers Rank	#100,519 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #136 in Multi Testers
Brand Name	Gardner Bender
Color	Black
Customer Reviews	4.3 4.3 out of 5 stars (1,063)
Global Trade Identification Number	00032076073008
Included Components	Gardner Bender GMT-319 Multimeter Tester, RJ-45 & RJ-11, 19 Range
Item Dimensions	2 x 2 x 3 inches
Item Type Name	Gardner Bender GMT-319 Multimeter Tester, RJ-45 & RJ-11, 19 Range
Item Weight	0.27 g
Manufacturer	nVent GARDNER BENDER
Measurement Type	Multimeter
Model	GMT-319
Number of Items	1
Part Number	GMT-319
Power Source	Battery Powered
Style Name	7 Function / 19 Range
UPC	032076073008
Unit Count	1 Count
Warranty Description	Warranty

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