The FLIR CM57-NIST is an ergonomic tool designed to simplify difficult current measurements. Made with a narrow, 18-inch (45.72 cm) flexible coil clamp, the CM57-NIST lets you easily take measurements in tight or awkward spots. It is ideal for multiple-conductor measurements and double-wrap requirements. With Bluetooth® communication for remote viewing and data transfer to iOS® and Android™ devices via the FLIR Tools Mobile app, you can analyze and share data fast right from the jobsite. Comes with certificate traceable to NIST.