TDS pen calibration

I bought some calibration solution that says 1500 ppm at .70 conversion factor.

It says to dip it into the solution and calibrate it to 1500. Well when I put it in it said 70.(you multiply by 10 to get the ppm) I turned the calibration dial to put it to 150 and it only went up to 90.

Does this mean I need a new pen? Or what am I doing wrong?

Thanks

Who makes your pen? Are you sure your pen isn't on the other standard of .50?

Hanna TDS 601

cwil916 said:

Hanna TDS 601

Click to expand...

Is it this one?

If so here is the manual: Sorry the PDF is to large for the site, it is at the bottom of this page: OpenDNS