The biggest difference between the older model, Classic, and the Classic 3 is the number of liters you can treat with a set of batteries. Classic 3 has improved circuitry which allows effective use of alkaline batteries. With the Classic, only lithium batteries were recommended. With Classic 3 you can treat about 50 liters using alkaline or 150 liters using lithium. Other improvements were added - like the cap is easier to remove and the casing is more watertight. The LED indicators tell you the status of the treatment and the batteries and warn you when you have 100 treatments left (out of 8,000 treatments provided). If you register it at steripen.com, they'll give you a new SteriPEN if you use all 8,000 treatments.
Date published: 2018-02-11