Hello urja,
I have made a feasibility study regarding the need for an in-house laboratory, the report is in my website under the articles portion.
We use internormen particle counter which I approved from management. What is important in choosing a particle counter is not the cost but first it must be calibrated on ISO 4406:99
Kindly refer to the link : www.rsareliability.com
My Warm Regards,
Rolly Angeles
www.rsareliability.com