Replacement Laser Counters
Replacement Laser Counters
Replacement Laser Counters
Replacement Laser Counters

Replacement Laser Counters

Regular price
Sale price

Plantower laser counters may need replacing for various reasons including age, contamination inside the device or simply failing after a long time in service.

Here you can purchase replacement particle detectors. They come in pairs for the PA-II series devices with a plastic component to aid in locating supporting parts. 

All Plantower laser counters have been pre-tested in PurpleAir test chambers.

  • NOTE: Please be sure to select the correct laser counter set for your device:
    • Each type has different connectors or mounting methods
    • The images can help identify what you have.
  • For information and instructions on replacing your laser counters, please see the videos linked in the following Community Post:
Quantity must be 1 or more
Shipping calculated at checkout.

  • Dual Laser Particle Counters (PMS-5003)
Laser Particle Counters

Class 1 Laser. A Class 1 laser is safe under all conditions of normal use.

Manufacturer Plantower

This device contains two particle detectors to provide redundancy and help determine sensor health.

Type PMS-5003 (2)
Range of measurement 0.3, 0.5, 1.0, 2.5, 5.0, & 10 μm
Counting efficiency 50% at 0.3μm & 98% at ≥0.5μm
Effective range
(PM2.5 standard)*
0 to 500 μg/m³
Maximum range (PM2.5 standard)* ≥1000 μg/m³
Maximum consistency error (PM2.5 standard) ±10% at 100 to 500μg/m³ & ±10μg/m³ at 0 to 100μg/m³
Standard Volume 0.1 liter
Single response time ≤1 second
Total response time ≤10 seconds

Customer Reviews

Based on 59 reviews
Nicholas O'Neil
Amazing customer service

When I noticed my PurpleAir data showing low confidence in the readings I contacted them to inquire about possible issues. They took the time to look at the data, and concluded I had a pair of faulty sensors. They shipped new sensors to me, gave me clear instructions on how to install them, and resolved a reporting problem with the data once they were back up and running. Responses were courteous, prompt, and well thought out. They took the time to help troubleshoot the issue on their end and it led to the issue being resolved quickly. I really appreciate their dedication and it shows in such a well performing product.

Duncan W
Works great & good service

Works great. Was led astray by the UI when ordering so wound up with the wrong counters. Was grateful they remedied the problem at no added cost to me = great service.

Now I have them they are working much better. Removal and installation was straightforward. Helpful staff and great + important product. Thank you!

Rick Trauth
Great service

Considerate informed service. 5 star!

Stanley Stone
Repair Parts

I purchased replacement particle monitors (one of mine had died). These run 24/7 so I wasn’t surprised that one had failed after many years in service. It was very nice that I could get the spare parts and repair it myself. They even changed the data presented to not use the output of the failed PM. Very happy to have it back on the air—this is the third residence that I’ve used the monitor on.

Gary Trumpp
Replacement Laser counter

Easy to change took 15 to 20 minutes.