High voltage low current systems analysis

I have one of these- [login to view URL] A high voltage DC electrostatic negative ion generator. I need to be able to accurately measure the current at the output to ensure that it can be used safely. I need an experienced electronic or electrical engineer who can measure multiKV currents in DC. I intend to produce a large negatively charged output across a series of pins or across a beam of metal to allow the negative ions to collect and act as an electrostatic potential to attract positively charged particles to it. However I am concerned about working with voltages in this range. I have experimented with 3kV for the same project using a smaller scale 5v input to 3kV output and managed to not electrocuted myself, however I am concerned that if I use 20kV I will be at risk of electrocution. The work can be completed remotely if advice is provided online as to how to measure this accurately and safely. There is potential for future contracts, as I am intending to built a product with a market in mind using this technology. If the professional who accepts and completes this project is shown to be capable and experienced, there will be an opportunity to sign a NDA and join my team. The product has been proven to work as a prototype and I am looking to scale up to increase the effect. Good luck and thank you for reading.