MET ONE HHPC+ Series Handheld Air Particle Counters

The MET ONE HHPC+ Series handheld particle counters are designed for fast, accurate monitoring in cleanroom and controlled environments—especially in hard-to-reach areas. Lightweight and built for single-hand operation, they’re ideal for routine monitoring, spot-checking critical zones, identifying particle sources in production lines, and troubleshooting filter leaks. Whether you’re working in a mini-environment or maintaining ISO Class 5 to 7 cleanrooms, the HHPC+ Series provides the portability and precision needed for contamination control.

  • Enhanced Mobility Portable design lets users quickly reach tight spaces and critical control points without interrupting workflow.
  • Faster Troubleshooting Rapidly isolate particle contamination sources or filter leaks to minimize downtime and maintain product quality.
  • Improved Data Integrity Digital transfer options support 21 CFR Part 11 compliance for audit readiness and accurate reporting.
  • Versatile Monitoring Suitable for cleanrooms, laminar flow benches, isolators, and process equipment.


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MET ONE Handheld Air Particle Counters

MET ONE Hand Held Air Particle Counter (HHPC) Features

Cleanroom Compliance

  • Cleanroom-Ready Performance: Supports cleanroom classification from ISO Class 5 to 7 with precise particle detection.
  • Regulatory Compliance: Meets ISO 14644-1 cleanroom standards and uses 21 CFR Part 11 features to enable support for electronic records compliance.

Particle Detection & Monitoring

  • Wide Detection Range: Measures particles from 0.3 µm to 10.0 µm with models offering 2 to 6 channel configurations.
  • High-Resolution Display: Easy-to-read color screen provides clear visualization of real-time particle counts.

Easy Operation & Connectivity

  • Compact, Ergonomic Design: Lightweight and built for single-hand operation, perfect for use in mini-environments or confined spaces.
  • Flexible Data Transfer: Connect via Ethernet, USB, or direct cable for efficient data access and analysis on your PC.

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Classifying a Small Cleanroom using the MET ONE HHPC 6+ This applications note will demonstrate the classification of a small ISO Class 5 Clean room and associated ISO Class 7 gowning room using a MET ONE model HHPC 6+ handheld particle counter. Reference will be made to the ISO 14644-1 clean room classification standard with regards to sample size, locations selected, limits and calculations necessary to determine the compliance status of the clean zone to ISO 14644-1 Class 5.
Modern Trends in Non‐Viable Particle Monitoring during Aseptic Processing This paper describes changes and improvements to non‐viable particle monitoring (NVP), sometimes referred to as total particulate monitoring, which is a regulatory requirement during aseptic processing. Aseptic processing is becoming more automated and increasingly important to future products of the biopharmaceutical industry. In the same manner, NVP monitoring is also becoming more automated and increasingly important for contamination risk management during aseptic processing.
Introduction to MET ONE HHPC+ Air Particle Counter eLearning eLearning (10 minutes): This course provides the background, theory and recommendations for instrument set-up for the handheld MET ONE HHPC+.
A Simple Guide to Selecting the Right Handheld Particle Counter for Monitoring Controlled Environments
製品カタログ_MET ONE HHPC+ シリーズ

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FAQ on MET ONE HHPC+ Series Handheld Air Particle Counters

Why use a handheld particle counter?

Handheld particle counters provide flexibility and mobility that can make it easier to evaluate multiple monitoring locations throughout a facility. They are often used for cleanroom certification, troubleshooting activities, contamination investigations and routine environmental monitoring.

Can the MET ONE HHPC+ Handheld Air Particle Counters be used in GMP cleanrooms?

Yes. The MET ONE HHPC+ Handheld Air Particle Counters is designed for use in cleanrooms and controlled environments, helping support environmental monitoring activities, cleanroom classification efforts and contamination control programs.

How is a handheld particle counter different from a remote particle counter?

A handheld particle counter is designed for portable operation and monitoring at multiple locations, while remote particle counters are typically installed in fixed locations as part of a continuous monitoring system. Handheld instruments are often preferred for spot checks, investigations and certification activities.

What applications are best suited for the HHPC+ Handheld Air Particle Counters?

The HHPC+ Handheld Air Particle Counters are well suited for cleanroom certification, environmental monitoring, process verification, troubleshooting investigations, filter testing support and routine airborne particle monitoring activities throughout controlled environments.

What’s the difference between the MET ONE HHPC 2+, HHPC 3+ and HHPC 6+ Handheld Air Particle Counters?

The differences are particle-size sensitivity and the number of measurement channels:

  • HHPC 2+: Two channels, starting at 0.5 µm
  • HHPC 3+: Three channels, with 0.3 or 0.5 µm configurations
  • HHPC 6+: Six channels across 0.3 to 10.0 µm

We recommend you choose a counter based on the smallest particle size and number of channels required for your application.

What are the MET ONE HHPC+ Handheld Air Particle Counters used for?

The MET ONE HHPC+ Handheld Air Particle Counters are designed for portable airborne particle monitoring in cleanrooms and controlled environments. Their lightweight design enables users to quickly perform routine monitoring, spot checks, environmental assessments and cleanroom verification activities.

Which industries commonly use handheld particle counters?

Handheld particle counters are frequently used in pharmaceutical manufacturing, biotechnology laboratories, medical device production facilities, and other controlled spaces where portable airborne particle monitoring is required.