This is a mini size clamp current probe. It can convert the test current into a voltage output. As an adapter of the oscilloscope. It is very convenient to use this probe to test AC or DC current in any conductor. It is an ideal tester for maintenance and inspection work on all types of electrical equipment Features: [Quick and Accurate AC/DC Amp Oscilloscope Probe] is based on hall effect technology and is designed to be used in conjunction with multimeter for ac and dc current measurements. [Max. Jaw Opening] The clamp measures the AC current in a conductor up to 23mm without interrupting the circuit. [Multifunctional & Easy to Use] Range switch, used to turn on/ off the current probe as well as to select the desired,range, ZERO button, AC/DC button. [Handheld Electrical Tester] AC/DC current probe oscilloscope probe, it's suitable for the electrical repair,quality assurance [Portable & Widely Used] Whether you're working on home appliances, cars, motorcycles, RVs, laboratories, or industrial equipment maintenance, this AC/DC clamp meter is your trusty companion. From battery power detection to power plant maintenance and railroad repairs, it's your one-stop piece of equipment for all your measurement needs. Specifications: Material: ABS Test Range: 4A to 400A Error By Earth Magnetic : ±30MA Max Remanence (± 100A/10A) : ±30MA Max Bandwidth : DC 200KHZ (± 3db) Jaw size : 23mm (Max) Auto Zero at Power on Low Battery Indication Power supply: 9V 6F22 Battery (not included) Operating Temperature: O to 50 , ≤ 70 % RH Item Size: 180 * 68 * 32 mm / 7.09 * 2.68 * 1.26 inch Item Weight: 250g / 8.82oz Packing Size: 22 * 10.5 * 4.8 cm / 8.66 * 4.13 * 1.89 inch Packing Weight: 280g / 9.88oz Packing List: 1 * Current Probe 1 * Cloth Bag 1 * Manual (English)