~TKS for your  inquiry for Helmke Drum.
By the way, we know that Cleanroom laundry want to know and test their cleanroom clothes.
So, you need these machines of Airborne Particle Counter and Helmke Drum to verify your laundering process.
And, you must follow the rule of IEST-RP-CC003.3 to know your class of 0.3 and 0.5um after your laundering process.
You must know that your Class of DI-Water,too.
Because the clean laundering process is very important of  DI-water controling by our professional experience.
So, We s est strong that you need Liquid Particle counter to verify your DIW.
Please confirm the attached files to let you understand your need machine and instrument.
 
The Price of RTC-3000(USA) Helmke Drum is about .-(Ex-work).
Delivery is about 6~8weeks
The Price of  MetOne2400 is about .-(Ex-work)
Delivery is about 5~7weeks
The Price of  MetOne3413 is about .-(Ex-work)
Delivery is about 5~7weeks
The Price of UP-100+MicroPump for test wipper(0.1 to 5.0um ) is about ..-(Ex-work)
The Price of 8103+MC05 for test wipper(0.5~350 micron) is about ..-(Ex-work)
Delivery is about 5~7weeks
The Price of 9703+MC05 for test wipper(0.5~350 micron) is about ..-(Ex-work)
Delivery is about 5~7weeks
The Price of UP-100 for UPW System is about ..-(Ex-work)
Delivery is about 5~7weeks
If you have a chance to do this order, we will offer the rule of IEST-RP-CC003.2 free to you.

 If you have any question, please feel free to let me know.
TKS and Best Regards,