Works great, a lot better than those cheap junks.

cheap foreign junk, and I say foreign because Amazon will censor me if I say the "C" word

It is pure Junk

so now I have a nice looking piece of junk becuase it doesnt work.

This ph pen is unreliable junk!

What more could you want?I went through numerous cheaper pen type units (purple, blue, you know the ones) over the years, and I finally got tired of wasting my money on cheap junk