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 Package Includes: 1x Pointer Ammeter note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.