Amazon.com: Universal ECG/EKG Electrodes Limb Clamp Reusable Nickel Banana Clip Din Clip Adapter Both 4.0 and 3.0mm Adult Size Set of 4PCS : Health & Household
Welch Allyn EKG Alligator Clips (Set of 10)
Reusable ECG Alligator Clip Adapters 9101-20-58104 All Vet Sizes ECG Alligator Clip Adapters
Clips-Red ECG Adaptor Fits any 3 mm to 4 mm lead wire (set of 10).