Ph Pen

[kennygater]

Does anyone know how to use a ph pen? I don't get the screwdriver bit

 

[cooper1973]

screwdriver bit is to calibrate with solution

 

[kennygater]

screwdriver bit is to calibrate with solution

Do you just calibrate it the once or every time you use it? Thanks

 

[cooper1973]

it should only need calibrating once but check from time to time as knocking them can sometimes throw them out, they usually come already calibrated but i would check with where u got it from. you will need to buy calibration fluid for calibrating