... Isolation between each channel,no interference3. Display, 6 digits LED 4.Data-logging function, Imported fixed probe,penless,anti-knock,no consumption ... indicate when ordering) 12. Analog output, 2 line analog output 4 -20 mA (Please indicate when ordering) 13. Sampling cycle, 0.6S ... 19. Working environment, temperature: 0~50C; humidity, 10~85 % RH 20. Power supply, 220 V; 50 Hz 21. Panel size, 144 ...