Product details: 1. Model: SO-45-A 2. Color: Black 3. Accuracy: 2.5 4. Size: 47 mm x47mm x 45 mm ( L* H * W) 5. Package:1* DC Analog Current Panel Meter.(with the mounting nut) 6. Measuring Range: A ccording to your choice . If the meter you need is more than 10A(such as 30A/75mV) that require the same constant value of shunt to be used. First. Use This instrument is a switched magnetoelectric instrument, which is used for measurement of AC / DC current or voltage. The ambient temperature is - 2 0 - +55, and the relative humidity is not more than 96% (25). Two . S pecifications AC ammeter 0.5~ 5 0A (direct acce) 5A~15KA (connected by current transformer, secondary current 5A) AC voltmeter 5V~600V (direct acce) DC ammeter (direct acce) ( 50u A~10A) 15A~15KA (using external partition constant value shunt) Direct current voltmeter (direct acce) (5V~600V) Three. The main technical characteristics 1. the damping time is le than 4S. 2. Insulation strength: AC2000V (50HZ), 1 minutes . Four. Use of rules 1 .W ork position: vertical. 2 . I nstrument installation should be fastened, not loose or inclined. 3 . T he current ratio of the external current transformer must be in line with the calibration ratio of the instrument, and the accuracy grade is matched. Notes: 1. Please allowed 1-3mm differences due to manual measurement. :) 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Make sure that the correct parameters are selected and leave a meage: the size, voltage, model and so on.