The DT266 Digital Clamp Meter is a portable, battery-powered electrical tester designed primarily for commercial, industrial, and heavy-duty residential troubleshooting.The device combines a standard digital multimeter with a current clamp sensor.It is constructed out of a durable black and yellow impact-resistant plastic casing.The top section features a large teardrop-shaped yellow clamp jaw that opens manually using a spring-loaded side trigger.The middle of the body houses a large manual rotary dial switch used to select functions and ranges.