What does the K=10 and K=1 standard for? 

Does the Gravity: Analog Electrical Conductivity Sensor PRO (K=1) mesure a value as a sample 1.413 without jumping up and down? Someone testet it? 

What variables need to be modified?

From DF page (https://wiki.dfrobot.com/Gravity_Analog_Electrical_Conductivity_Sensor_Meter_K=10_SKU_DFR0300-H) sample code in 1.4 test solution. 

voltage:32.00  temperature:25.0^C  EC:1.4ms/cm

voltage:41.00  temperature:25.0^C  EC:1.8ms/cm

voltage:29.00  temperature:25.0^C  EC:1.3ms/cm

voltage:38.00  temperature:25.0^C  EC:1.7ms/cm

voltage:51.00  temperature:25.0^C  EC:2.2ms/cm

voltage:32.00  temperature:25.0^C  EC:1.4ms/cm

voltage:38.00  temperature:25.0^C  EC:1.7ms/cm

voltage:51.00  temperature:25.0^C  EC:2.2ms/cm

voltage:32.00  temperature:25.0^C  EC:1.4ms/cm

voltage:29.00  temperature:25.0^C  EC:1.3ms/cm

voltage:25.00  temperature:25.0^C  EC:1.1ms/cm

voltage:45.00  temperature:25.0^C  EC:2.0ms/cm

voltage:32.00  temperature:25.0^C  EC:1.4ms/cm

voltage:38.00  temperature:25.0^C  EC:1.7ms/cm

voltage:25.00  temperature:25.0^C  EC:1.1ms/cm

UNO, FireBettle esp32-e and MKR 1010 Wifi

Also buy a new meter, a was thinking the old one was broken. 

I have calibrate it on 3 different bords with alot of different values for voltage, tested 3,3 and 5 v. Same all the time, soon give up on this. 

When I calibrate the sensors EC and PH on a UNO bord it works, But when a switch back to Beetle esp32 e the calibration dosent work and a cant calibrate on the Beetle esp32 e. So what to do? What is the best card for me to use in this case?