The Fieldpiece ACH4 Current Clamp Accessory Head is a small accessory head for quickly reading up to 400 AC amps. The ACH4's claw feature at the top of the clamp allows for quickly picking out the wire users need to measure and isolating it in the clamp. Once the current carrying conductor is isolated, the amperage is converted to mVAC for reading directly on the meter. The ACH4 works with the Fieldpiece Stick Meters, EHDL1 Electronic Handle, DL3 Data Logger, HG2 HVAC Guide System Analyzer, or any other digital multimeter with mVAC range when connected by the Fieldpiece ADLS2 Detachable Silicone Leads or AHDL1 Handle Adapter.