iFlex flexible current probe (sold separately) expands the measurement range to 2500 A ac while providing increased display flexibility, ability to measure awkward sized conductors and improved wire access Proprietary inrush measurement technology to filter out noise and capture motor starting current exactly as the circuit protection sees it Ergonomic design fits in your hand and can be used while wearing protective equipment Large, easy to read backlight display automatically sets the correct measurement range so you do not need to change the switch positions while taking a measurement Features CAT III 1000 V, CAT IV 600 V safety rating True-rms ac voltage and current for accurate measurements on non-linear signals 500 mV dc measurement range to interface with other accessories Integrated low pass filter and state of the art signal processing allows for use in noisy electrical environments while providing stable readings