NuPrep Skin Prep Gel (10-30) by Weaver. NuPrep gel is useful whenever a reduction of skin impedance would enhance a test result. ECG Stress Tests, Cardiac Rehab Monitoring, Holter Monitoring are appropriate procedures where NuPrep gel is outstanding. In 4 oz. tubes. Appropriately abrasive. (3)TUBES/BX. Priced per box.