Measuring Po4

Hi, I have bought the KH Director and I use it successfully.
I looked at ION Director, however the more critical matter to follow is the phosphate and unfortunately this is not measured. I would have preferred one product measuring only phosphate rather than the ION despite it measures 4 or 5 matters.
Can you please tell me why there is nothing regarding phosphate today while it seems not more sophisticated than measuring KH or nitrate (even easier).
Look forward to have something measuring the phosphate!!!
Thanks

Phosphate measurement with a sensor is a significantly more complex process than the other parameters. There is also the challenge of not only finding a sensor that is capable of measuring low PO4 values such as 0.02, but also measuring it accurately. It is not like measuring calcium where those values are much higher and easier to detect. Nonetheless, the hardware is ready for future expansion and our research into other possibilities continue. :)