Testo 535 Digital CO₂ Meter (0563 0535)
— a compact, highly accurate carbon dioxide measuring instrument that lets technicians quickly verify indoor air quality, assess workplace ventilation and document results with the Testo Smart App. It measures 0–10,000 ppm CO₂ using a long-term stable infrared sensor and sounds an audible alarm on threshold breaches. No dramas—fast, accurate, and built for Australian job sites.
Key Features & Trade Benefits
- 0–10,000 ppm range — capture precise indoor air quality (IAQ) metrics accurately, so your ventilation checks hold up.
- Long-term stable NDIR sensor — highly reproducible and comparable measurement results without the need for frequent recalibration.
- Highly accurate — ensures reliable indoor climate assessments and fewer call-backs.
- Smart App workflow — configure thresholds, view trends, store readings and export PDF/CSV reports straight from site—too easy.
- Timed & point averaging — document realistic IAQ performance over time, not just snapshots.
- Audible limit alarm — set max CO₂ targets and get a beep when levels drift—saves time during audits.
- Rugged, lightweight build (IP40 instrument) — easy to carry and tough enough for daily site work.
Why This Product Matters
On a Sydney office fit-out or a school HVAC upgrade, you’re checking ventilation effectiveness. With the 535, you’ll nail the target 800–1000 ppm brief in minutes, log averages, and export a clean report before the lift hits ground. Fair dinkum time-saver. If you’re comparing options, see our Environmental Testers to build out your test kit.
AS 1668.2
Tradie Pro Tip: Keep the sensor well-exposed in the breathing zone (e.g., desk height) and avoid breathing directly onto the probe. Then, log multi-point and timed averages for each room. Name locations in the Smart App as you go—she’ll be right when the report lands.
Compatibility & System Info
- Measured gases: Ambient carbon dioxide (CO₂).
- Smart App: iOS 13+ / Android 8.0+ via Bluetooth (BLE 4.2 or higher).
- Use cases: Offices, schools, commercial buildings, healthcare, retail, and facility maintenance.
Local Jobsite Note (AU)
From stuffy meeting rooms in Melbourne to crowded retail spaces in Brisbane, poor airflow can cause sudden CO₂ spikes. Use timed averaging and the alarm to track overall ventilation performance and keep it tidy—no worries.
What’s Included
- Testo 535 Digital CO₂ Meter (0563 0535)
- Transport bag
- Calibration protocol
- 3 × AA batteries
Instructions / Manual:
Specifications
| Item | Spec |
|---|---|
| Measuring range | 0 to 10,000 ppm CO₂ |
| Accuracy | ±(100 ppm + 5% of m.v.) |
| Resolution | 1 ppm |
| Sensor | 2-channel infrared sensor (NDIR) |
| Functions | Point & timed averaging, audible limit alarm, Bluetooth® App reporting |
| Operating temp | 0 to +50 °C |
| Protection class | Instrument IP40; probe IP20 |
| Power | 3 × AA; ~30 h |
| Dimensions / weight | 229 × 60 × 28 mm; 229 g |
Warranty & Returns
Testo AU warranty: instruments 24 months (typical), accessories 12 months. Register with Testo for possible extended coverage. HVAC Shop standard returns apply.