710 Life eNail Kit | Fastest & Best eNail Available | 420 Life · on-board memory. ! Temperature range: 0F – 1200F – Recommended Usage Below 1000F. Enails: The 710 LIFE e-nail is the best-priced quality enail and a must-have upgrade for aromatherapy with your essential oils. It will enhance your experience allowing you to accurately control the temperature of each use.