CT6021A
1. Range: 0.0 ~ 14.0PH
2. Error: 0.1PH

CT6322
1. PH meter / conductivity / temperature
2. Data retention function
3. Automatic temperature compensation function

CT8023
1. Measurement range: 0 ~ 2400ppb
2. Measurement accuracy: +-10ppb
3. Resolution: 2ppb
4. Temperature range: 0 to 50 degrees
5. Resolution: 0.1 degrees
6. With automatic shutdown function
7. With data lock function
8. With waterproof function
9. Product battery: LR44 BAT*4
10. Product size: 188 × 38 mm
11. Product weight: 82 grams