Keep a proper record of what’s really happening on site with reliable temperature and humidity data loggers. This collection brings together Testo standalone loggers and Fieldpiece Job Link Bluetooth probes so HVAC techs, refrigeration contractors and facility managers can track conditions over time, not just take a single spot reading.
A data logger is a compact electronic device that automatically measures and stores readings – typically temperature and/or humidity – at set intervals. Instead of checking a thermometer a few times a day, the logger quietly records every reading in the background, building up a full history you can download and analyse later.
In HVAC and refrigeration work, that history is gold. It helps you prove that a cool room, freezer, office or plantroom stayed within target limits, and it highlights any times where systems drifted out of spec so you can fix the root cause instead of guessing.
Testo 175 series loggers are classic standalone instruments with onboard memory and display. Models like the Testo 175 T1, T2 and T3 focus on temperature, while the Testo 175 H1 adds humidity for comfort and IAQ checks. They’re ideal where you want a dedicated logger installed in a room, cool room, freezer or plant area and downloaded via USB in the office.
Several Fieldpiece Job Link probes in this collection can log readings through the Job Link app. Pipe clamp, pressure and psychrometer probes can all send temperature, pressure and airflow-related data to your phone or tablet, where it’s stored by job and can be exported for reports.
To save time on site, you’ll also find Testo probe kits that bundle immersion/penetration, air and surface probes together, as well as Fieldpiece charge and air test kits that combine multiple Job Link tools into one carry case. These kits are ideal if you want everything needed for logging in one grab-and-go setup.
Our data loggers and logging probes are used across a wide range of Australian jobs, including:
Not sure which logger or probe kit to pick? Use this quick guide, then check each product page for detailed specs, memory size and software/app compatibility.
If you’d like a recommendation for a specific project or site, you can contact us via the Contact Us page with details of your application, temperature range and any compliance requirements.
HVAC systems can account for a big share of energy use in commercial buildings, so proving how they actually run in the field is critical. Data loggers help you:
For a full test setup, you can combine loggers with other tools in our test & measurement collection, including Bluetooth smart tools, thermal imaging cameras and hygrometers.
Both approaches are useful – they just suit different jobs:
A normal thermometer gives you a single reading at a point in time. A data logger automatically records readings at set intervals (for example every 1, 5 or 15 minutes) and stores them in memory. That means you can review a full temperature or humidity history, spot patterns and prove what happened when you weren’t on site.
Yes – that’s one of the most common uses. Temperature data loggers are widely used in food, cold storage and healthcare applications to demonstrate that products stayed within safe limits. Always check the operating temperature range, sensor type and any applicable food safety or cold chain expectations for your industry, and position the probe where it best represents product temperature rather than just air at the door.
Standalone Testo loggers are usually downloaded via USB and read using the manufacturer’s free software. Bluetooth probes log through their companion apps (such as the Fieldpiece Job Link app or the Testo Smart App) on Apple or Android devices. Check each product page for details on software/app compatibility and any optional cloud features.
That depends on the application. For many comfort and HVAC tuning jobs, reviewing data weekly or at the end of a specific test period is fine. For cold chain, food or medical storage, you may need more frequent checks and documented reviews to meet your internal procedures or external audit requirements. Always follow your organisation’s quality system and any industry guidance you work under.
Accuracy is specified by each manufacturer for the relevant sensor type and temperature/humidity range. Testo and Fieldpiece publish detailed accuracy figures on their datasheets and recommend regular calibration for critical applications. For work where compliance is important, refer to the product datasheet and consider a calibration schedule that matches your quality procedures.
If you need a permanent logger that can sit in one location for months with simple, reliable downloads, a USB data logger is often the simplest and most robust option. If you mainly log while you’re on site working on the system, Bluetooth probes with app-based logging are hard to beat for speed and reporting. Many technicians end up using both styles depending on the job.
Data loggers are even more powerful when combined with other instruments. You can build a complete test kit using: Bluetooth smart tools, hygrometers, indoor air quality meters and thermal imaging cameras.
For shipping timeframes, returns and warranty details on data loggers and logging probes, see our Shipping & Returns page.
Author: HVAC Shop Content Team – HVAC Content Specialist
Reviewed by: Licensed HVAC Technician ARCtick-accredited
Business details: HVAC Shop • ABN 98 351 143 900 • Phone: 0412 333 115 • Email: hvacshop.com.au@gmail.com
Methodology & data sources: Product specifications for Testo 175 series loggers and Fieldpiece Job Link probes, combined with Australian guidance on HVAC energy efficiency, commissioning, building tuning and temperature control in food and cold storage. Independent information on HVAC energy performance and building tuning is available from energy.gov.au, while food businesses can refer to temperature control advice from Food Standards Australia New Zealand (FSANZ).
Last updated: 2025-11-29 (AEST)
