Features: This ammeter is a reliable and widely-used direct-action analog indicator instrument suitable for both DC-and AC-circuit measurement with a range of 1A-to 500A, making it an essential tool for monitoring-voltage, current, power, frequency, and power factor. With a sleek-and elegant design, this ammeter features a transparent-plastic shell-that allows for quick and-easy reading of the scale, precise readings, and convenient installation with no need for additional shunts. Ideal-for industrial and mining-enterprises, metallurgy-chemical industry, electric power, complete set of equipment, and all kinds of electronic control devices, as well as individuals looking to replace broken instruments or monitor-their electrical circuits. Whether you're measuring current or other voltage-measurement devices, this ammeter is perfect-for a wide range of applications, from monitoring battery chargers to measuring current in your home or business. Made-of high-quality ABS-material and conforming to-GB/T7676-2002 national-standard requirements, this ammeter is a reliable and durable tool that will provide accurate readings for-years to come. Specifications: Size:Approx.6.4x5.6cm/2.51x2.2inch Opening size: diameter:50mm/1.96inch Accuracy grade: 1.5/2.5. Service conditions: -20~+50 Relative humidity 85%(25) Mechanical resistance: it can withstand-acceleration of 30m/s, impact frequency of 80~120times per-minute, and 2-hour transportation jolt-test. Insulation strength: AC50Hz, 2KV, lasting for 1 minutes. Voltage-influence: when the rated-value changes by 15%, the indicated value error will not exceed the specified basic error. Installation position: vertical installation Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Pointer Ammeter