This AC 0-3A Panel Ammeter is specially designed for measuring Ampere and monitoring battery and electrical system, easy to use. Measures current range of AC 0-3A with accuracy of Class 2.5. Clear and easy to read scale and a button for fine tuning the dial. Product Name : Analog Ammeter Model : SO-45 Mount Size : 37 x 37mm/ 1.5 x 1.5inch (L x W) Meter Face Dia.() : 45mm/ 1.8inch Thread Size : 4.5mm/ 0.18inch Overall Depth : 47mm/ 1.9inch Net Weight : 46g(1.6oz) Color : Black Material: Metal Measuring Current Range : AC 0-3A Accuracy : Class 2.5 Package Content:1 x Analog Ammeter with Installing Parts Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.