The AHDL1 Accessory Handle Adaptor Plugs Into Any Dmm with Industry Standard Jacks, Allowing You To Quickly Connect Any Of Our Accessory Head Instruments For Testing. Using Your Multimeter with 100's and 1,000's MVDC Ranges, Attach The Adaptor and Head To Measure Even More HVAC/R Parameters.We Designed The AHDL1 To Provide The Benefits Of Modular Expandability To Technicians Who Prefer Digital Multimeters Other Than Our Stick Meters. The AHDL1 Is The Same Shape and Size As The Top Of Our Stick Meters and Works with All Of Our Accessory Head Instruments. Simply Plug In The Banana Jacks. The Adaptor Handle Allows You To Easily Connect Our Accessory Head Instruments To Any Dmm MV Ranges Both AC and DC On Their Meter. Our Electronic Handles Convert Any Accessory Head Into A Standalone Instrument.