How Do You Know When a Lenspen is Worn Out

Before I start bearing [Sp?] down too hard, how would I know when my Lenspen is worn out and that I'm ready for a new one?

If any of the felt has worn off, its done! I use my Lenspen on binocs with concave shaped optics. The concave shaped Lenspen thus wears on the outer edges MUCH faster. When it wears down to just the rubber you're at risk of getting rubber smudges on your optics. If there's plenty of felt, I'd say its a performance issue, ie is your gear getting clean, that determines when its done. Do NOT bear down with the Lenspen. Should there be an entrapped piece of hard grit (grain of sand) you'd be sorry!

Thanks Russ, then my pen's had it, just ordered a new one. I could use this one for cleaning out my keyboard and hey maybe I can play detective around the house.

I've had my Lenspen a solid 4 years and use it regularly. Still going strong. Knock on wood

I have 3 lens pens and they've never worn out because I've never used em.

I just order a new one every now and then. They're only a couple of bucks...

when they stopped cleaning? you'll see it easily..it will start to smudge.