pH40
Microprocessor pH Tester with 2 points automatic calibration

pH41
Microprocessor pH Tester with automatic temperature compensation

pH42
Microprocessor pH Tester with automatic temperature compensation

C61
Microprocessor Conductivity Tester with automatic temperature compensation

C62
Microprocessor Conductivity Tester with automatic temperature compensation

T71
Microprocessor TDS Tester with automatic temperature compensation

T72
Microprocessor TDS Tester with automatic temperature compensation