Non-contact measurement on tightly packed cables is really easy and reliable with the testo 770-3 clamp meter. Its innovative grab mechanism will make your work easy. The most powerful model in the clamp meter series, it offers lots of additional functions for those challenging tasks that you are faced with on a daily basis, e.g. communication with the smartphone app via Bluetooth. Easy to operate thanks to the fully retractable pincer arm Auto AC/DC and large two-line display Improved TRMS method Bluetooth connection to your smartphone (with the testo Smart Probes App)