tds how to calibrate a HM digital Dm-1

[ricky stubbs]

I have recently purchased a 2nd hand TDS HM digital Dm-1 and wondering how I calibrate it to check my RO DD is giving me a true reading.
The only known solutions I have is Osmotic TDS calibration solution 240 ppm
So I am wondering do I put the output of the HM digital Dm-1 in this solutions and turn the dial on the back till I get 240ppm on the screen ??

 

[cromag27 Verified Sponsor]

I have recently purchased a 2nd hand TDS HM digital Dm-1 and wondering how I calibrate it to check my RO DD is giving me a true reading.
The only known solutions I have is Osmotic TDS calibration solution 240 ppm
So I am wondering do I put the output of the HM digital Dm-1 in this solutions and turn the dial on the back till I get 240ppm on the screen ??

check this out.

http://hmdigital.com/calibration-maintenance/

 

[ricky stubbs]

Thanks for that I read it, but still unsure if I can calibrate it to the solution I have got or I need to buy some of the one stated in that link

 

[cromag27 Verified Sponsor]

Thanks for that I read it, but still unsure if I can calibrate it to the solution I have got or I need to buy some of the one stated in that link

they recommend to use their own nacl 342ppm solution. not sure how accurate it would be with what you currently have.