purchasing Nitrate monitor

I am new to the EnviroDIY world.  I work at a nature center and we just installed our first water monitor.  At the moment all we have is temp, depth and conductivity, but we ar

I am new to the EnviroDIY world.  I work at a nature center and we just installed our first water monitor.  At the moment all we have is temp, depth and conductivity, but we are really after a nitrate monitor.  We share a border with a golf course that drains directly into our pond, so being able to link a flood of nitrates directly to the golf course would go a long way in our negotiations with them.

Where would one find a nitrate sensor that is compatible with the EnviroDIY kit

thanks,