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:

NOTICE: Lead times on the classic PA-II and PA-II-SD variants may now be as long as six (6) weeks. This is due to lead times on the PMS5003 Laser Counters. We will update this message as this situation changes.

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 19 reviews
martin magee
Replacement pms5003 sensors

The new pms5003 sensors were easy to fit and have restored readings to 100% correlation and are working well.

Ronnie H Davis

Easy. Works like the original.

Replaced laser counter in PurpleAir PA-SD-II

PurpleAir contacted me about a problem with a laser counter unit in one of our PA-SD-II devices (I didn't even realize there was a problem), and shipped replacement counters to us free of charge. Great service, thank you!

Ryan Demski
Inexpensive and easy install

I purchased replacement laser counters for my PA-II after one channel stopped reporting correctly. The parts arrived quickly. Installation was straightforward by following the linked video and took me about 15 minutes. I appreciate replacement parts are offered and look forward to several more years of reliable use for my sensor.

Neil Kelley
Replace laser comments

I purchased the replacement lasers in order to have backups for my dual and single sensors. There are no problems with the dual sensor and either of the two single ones but I would like to be prepared in the event that one fails.