From the left
1. brand A, PH 2, I've had it 15+ yrs.
2. brand B, PH 1, I've had it 2 yrs.
3. brand C, PH 2, I just got it in the mail.
4. brand C, PH 1, I've had it 18.5 years.
5. brand D, PH 2 bit for reference.
I bought # 3 because I had # 4 and find it very useful, and like the length &...