DOP SOLUTIONS’ PHOTOMETERS have been testing manufactured and installed HEPA and ULPA filters around the world for 25 years, and our latest innovation, the ‘dop touch’ is the most advanced user interface available in the world today.
The ‘dop touch’ is packed with every feature you might need to test, record and print the results of your Filter Testing, strengthening your compliance to ISO14644-3 and all other global cleanroom, containment system, and filter manufacturers Standards.
It is capable of testing all HEPA, ULPA and PTFE types of filter in-situ and as manufactured.


Optical stability measures aerosol concentrations as low as 1mg/m3, and penetration to 0.0001%, so PTFE filters and ULPA grades easily tested.
Auto calibration of aerosols from dropdown menu, includes for all common reagents/oil types.
Reports min/max/average challenge concentration. On screen Accept/Reject feature.
3 alarms - ‘dop touch’ Audio, Smartprobe LED and Vibrator means you won’t miss leaks.
On-screen keyboard for easy typing.
Toxic sampling optical system as standard, so safe for all pharma,biotech and nuclear applications.
Stainless steel case-robust and easily cleaned.

Easy to operate using touch screen interface.
Reversible use, flat or upright, screen autorotates.
Fast and easy setup in seconds, auto-calibrates to all globally used oil types.
Secure testing, calibration information recorded.
Retains calibration when powered down and moving between filter tests.
Light Smartprobe, audible and vibrating alarms, and sampling control.
Comprehensive test reports, printed to paper (USB A4 or tally roll) or USB flashdrive.
Warranty - TWO years for ‘dop touch’, one year for screen, and LIFETIME for Smartprobe.
International Language reports available.