Entry-level laser particle counters such as the Dylos DC1100 are listed at $199.99, with the DC1100 PRO at $260.99 and the DC1100 PRO with PC interface at $289.99, while a battery-operated DC1700 AQM sits at $425.00 and a PM2.5/PM10-specific DC1700-PM at $475.00 [S3].
At the commercial-IAQ tier, TSI's AirAssure family offers three configurable models — 8144-2 (2-gas), 8144-4 (4-gas including formaldehyde), and 8144-6 (6-gas covering O3, NO2, SO2, CO, VOC, CO2, plus PM, barometric pressure, and T/RH) — with the gas-count step being the single largest price multiplier in this segment [S2].
Sensing Technology Determines the Price Floor
Laser-scattering particle counters (the DC1100 platform) use a single photodetector and fan assembly to count particles in 0.5µm and 2.5µm bins, which is why the entry SKU lands at $199.99 rather than the several-thousand-dollar price points older laser counters commanded [S3]. The DC1700-PM at $475.00 adds dedicated PM2.5/PM10 mass reporting and battery operation, raising the bill of materials through a second optical chamber and a higher-current pump [S3].
At the IAQ-station level, TSI's 8144-2 is explicitly described as using "low-cost sensor technology" for CO2 and VOC — a deliberate cost-down versus NDIR reference-grade cells — while the 8144-4 adds an electrochemical formaldehyde channel and the 8144-6 adds O3, NO2, SO2, and CO electrochemical sensors in addition to NDIR CO2 and PID-style VOC [S2]. Each additional gas species typically adds one or more dedicated sensor modules plus the analog front-end channels to read them, which is the mechanical reason gas count moves the quote more than enclosure or display upgrades do.
The sensing technology also dictates what the instrument is FOR. A laser counter priced near $200 is a diagnostic tool for HVAC contractors ("before and after testing of high efficiency air filter installations and duct sealing jobs" per a Dylos customer) [S3], while a 6-gas IAQ station is a continuous compliance instrument for WELL-certified buildings, healthcare facilities, and petrochemical plants [S2].
Cost Drivers Ranked by Impact on Quote
From the two published price lists, four drivers account for almost all the delta between a $200 unit and a multi-thousand-dollar IAQ station:
1. Gas-species count: stepping from 2-gas to 6-gas on the TSI platform roughly doubles or triples sensor BOM cost because each new species is a discrete electrochemical or NDIR cell. 2. PM channel architecture: a basic 2-bin laser counter ($199.99) versus a dedicated PM2.5/PM10 mass-reporting chamber ($475.00) is a ~2.4x price step [S3]. 3. 4. Certifications and use-case alignment: WELL-targeted and petrochemical-plant instruments carry enclosure ratings, calibration certificates, and gas-specific cross-sensitivity documentation that industrial buyers can audit, which is not in scope for a $199.99 consumer-grade particle counter [S2].
Volume tier and lead time move the price secondarily: a small-office buyer paying list on a single 8144-6 will pay substantially more per unit than a national facility-management firm buying 200 mixed 8144-2/4/6 units for a rollout — but neither list price in the research [S2][S3] publishes volume breaks, so any number here would be invented.
Use-Case Fit: Who Each Price Tier Is For
The DC1100 at $199.99 is FOR HVAC contractors and home IAQ diagnostics — explicitly so, per the South Carolina contractor testimonial citing "before and after testing of high efficiency air filter installations and duct sealing jobs" — and is NOT intended for continuous 24/7 building monitoring or regulatory-grade gas reporting [S3].
The DC1700-PM at $475.00 is FOR portable PM2.5/PM10 surveys (battery-operated, no mains needed) and is NOT a substitute for a fixed multi-gas station because it does not report CO2, VOC, or toxic gases [S3].
The TSI AirAssure 8144-2/4/6 family is FOR continuous commercial IAQ monitoring — WELL Certification evidence trails, healthcare and assisted-living compliance, industrial manufacturing and power generation, and government/environmental-agency deployments [S2] — and is NOT the right pick for one-shot duct-sealing diagnostics where a $200 laser counter is sufficient.
Side-by-Side Comparison on Decision Criteria
Lining the three documented price points against decision criteria for an air quality monitor purchase: [S3]
Entry laser counter (Dylos DC1100, $199.99): measures 0.5µm and 2.5µm particle counts only; no gas channels; portable, USB-powered; suitable for HVAC and residential diagnostics; no continuous-monitoring data platform [S3].
Mid-tier PM station (Dylos DC1700-PM, $475.00): dedicated PM2.5/PM10 mass reporting; battery operation for field surveys; still no gas channels; higher pump and chamber cost; suitable for occupational hygiene walk-throughs [S3].
Multi-gas IAQ station (TSI AirAssure 8144-6, list price not disclosed): 6 gas channels plus PM, T/RH, barometric pressure; cloud-based TSI Link Solutions with user-defined alerts; targets WELL, healthcare, petrochemical; intended for permanent mounting and continuous data logging [S2].
The honest gap in the research is that TSI's exact MSRP per gas-tier is not published in the source material, so any dollar figure for the 8144-2/4/6 would be a guess. The Dylos price list is fully published; the TSI price list is not [S2][S3].
Standards, Calibration, and Sourcing Constraints
Indoor-air-quality instrumentation marketed for WELL Certification, healthcare, and government/agency use typically needs traceable calibration against the relevant gas standard, with electrochemical sensor lifetime rated in years rather than months — both of which are baked into the BOM cost of an 8144-class instrument but are absent from a $199.99 laser counter [S2].
For industrial hygiene work involving respirable dust, a PM2.5/PM10 channel should be cross-checked against the reference method used in the target jurisdiction; particle counters are screening tools, not compliance instruments, and the $200-tier explicitly does not carry the documentation a 6-gas IAQ station does [S2][S3].
Buyers specifying temperature and humidity monitoring alongside gas channels should confirm the IAQ station's T/RH sensor spec, since every 8144 model includes temperature and relative humidity as standard and a separate building-automation temperature monitor is often unnecessary when an IAQ station is already wall-mounted.
Total Cost of Ownership Beyond the Sticker
Purchase price is the smallest line item for a fixed IAQ installation. Electrochemical sensors for O3, NO2, SO2, and CO have a service life typically rated in years and must be replaced on a schedule; the calibration gas and bump-test kit for a 6-gas station is a recurring consumable cost that does not exist for a laser particle counter [S2].
Continuous-monitoring SKUs also need a data path: TSI Link Solutions is the published cloud platform for the AirAssure line, and subscriptions, cellular gateways, or BACnet/Modbus integration into a building management system each carry their own line item [S2]. A $199.99 laser counter has no subscription, but it also has no continuous-data capability — the trade is explicit.
For buyers weighing a 6-gas station against a network of cheaper PM-only nodes, the math usually favors one well-placed 6-gas unit in a lobby or loading dock plus cheaper PM nodes in secondary spaces, mirroring TSI's own guidance to "deploy a mix of the 6-gas, 4-gas and 2-gas monitors available in the AirAssure™ IAQ portfolio" [S2]. Cross-checking PM-only node selection against a dust particle meter vs lux meter sensor-class map is worth doing before committing to volume.
What the Two Published Price Lists Don't Tell You
Neither Dylos nor TSI publishes a volume-tier discount curve in the public material reviewed [S2][S3]. Lead times are not disclosed on either page. TSI's exact 8144-2/4/6 MSRP is absent, and warranty terms for both vendors are not stated in the research material — so any quote discussion with these vendors needs to surface list price, volume break, sensor-replacement schedule, and calibration-gas kit cost as four separate line items rather than a single sticker.
For industrial buyers also evaluating environmental controls alongside monitoring, the air pollution control systems map is a useful cross-reference because the same facilities that deploy 6-gas IAQ stations usually own some form of particulate or gas treatment upstream. The published price points to anchor a 2026 budget request remain: $199.99 (DC1100), $260.99 (DC1100 PRO), $289.99 (DC1100 PRO + PC interface), $425.00 (DC1700 battery AQM), and $475.00 (DC1700-PM PM2.5/PM10) [S3].
Spec-level background on the components involved: linear guide.