A data logger is a compact electronic instrument that automatically records measurements such as temperature, humidity, pressure or voltage at set intervals and stores them as time-stamped readings. Each unit combines a sensor, a microprocessor and internal memory in a battery-powered package that can run unattended for months or even years. Because every reading carries a date and time stamp, a data logger gives you an accurate, audit-ready record of exactly what happened and when, replacing manual record-keeping and the paper chart recorders that came before it.
This guide explains how data loggers work, what they measure, the main types available in Australia, the specifications that matter and how to choose the right one for your application.
The idea of recording conditions during shipment is not new. For decades, refrigerated trucks and shipping containers used paper chart recorders — rotating drums with a stylus drawing a wavy temperature line across a printed disc. They were better than nothing, but reading them required physical access to the device, the paper could be damaged or tampered with, and there was no way to know what was happening until someone opened the door.
Reporting intervals are typically configurable between 4Hz and 24 hours, depending on battery life priorities and the sensitivity of the shipment. A vaccine shipment might be configured to report every 5 minutes. A pallet of timber might report every hour. The cloud platform stores every reading permanently, building a complete auditable timeline for each shipment regardless of interval.
With a USB data logger, you simply plug the unit into a PC and download the readings through the free software MadgeTech 4, for example, which graphs the data and exports it as a CSV or tamper-evident PDF report for audits.
Wireless, Wi-Fi and NB-IoT models go a step further, transmitting readings in real time to a cloud platform so you can check conditions from anywhere and receive email or SMS alarms the moment a threshold is breached. Many single-use shipment loggers generate a PDF report automatically as soon as they are plugged in at the destination.
A data logger is a stand-alone, battery-powered recorder; a chart recorder is its paper-based predecessor, tracing readings with a pen on a rotating chart; and a data acquisition (DAQ) system is a permanently installed, computer-tethered setup that samples many channels at high speed. Data loggers have largely replaced chart recorders because they are more accurate, need no paper or ink and produce digital records ready for compliance reporting.
DAQ systems still suit high-speed laboratory and test-bench work, while modern loggers can also feed their data into wider IoT and SCADA systems. For everyday monitoring of cold rooms, transport, warehouses, processing lines, a data logger is the simplest and most cost-effective option.
Data loggers can measure almost any physical parameter, with temperature by far the most common. Across the data logger range, you will find models for:
USB data loggers are the most affordable and widely used type. You start the logger from your PC, place it where it needs to record and plug it back in later to download the data. They are ideal for transport monitoring, storage audits and any task where a live feed is not required.
Wireless data loggers transmit readings in real time to a receiver, gateway or cloud platform. There is no need to collect units to download data, and high or low alarm thresholds can trigger instant email or SMS alerts essential for vaccine fridges, cold rooms and server rooms where a failure must be caught immediately.
NB-IoT data loggers send data over the mobile network, so they work anywhere with cellular coverage, no Wi-Fi or gateway required. That makes them well suited to monitoring goods in transit across Australia, remote sites, and multi-site operations managed from a single dashboard.
Multi-channel data loggers record several inputs simultaneously; for example, eight thermocouple probes in different positions inside an oven, autoclave or cool room. They are the standard tool for validation, mapping studies and process profiling, often supplied as complete validation kits.
| Specification | What it tells you | Typical values |
| Sampling (logging) rate | How often a reading is taken | 1 second to 24 hours |
| Memory capacity | How many readings can be stored | 8,000 to 1,000,000+ |
| Accuracy | How close readings are to the true value | ±0.5 °C; ±2% RH |
| Measurement range | The span the sensor can handle | e.g. −40 °C to +140 °C |
| Battery life | How long it runs stand-alone | 1 to 10 years |
| Connectivity | How you retrieve the data | USB, wireless, Wi-Fi, Bluetooth, NB-IoT |
| IP rating | Dust and water resistance | IP54 to IP68 |
| Alarms | Alerts on threshold breaches | High/low limits, LED, email/SMS |
| Calibration certificate | Proof of traceable accuracy | NATA-traceable, renewed yearly |
Yes, any data logger used for compliance, quality or audit purposes should hold a current calibration certificate, with recalibration typically every 12 months. Calibration checks the logger’s readings against a reference standard and documents any deviation. In Australia, a NATA-traceable certificate is the accepted proof of accuracy for HACCP, TGA and GMP audits, and supporting software with secure audit trails helps meet FDA 21 CFR Part 11 requirements for electronic records. Pacific Sensor Technologies provides NATA-traceable calibration services for new and existing instruments, so your loggers stay audit-ready year after year.
If you are unsure, start with the application rather than the product. As the authorised Australian distributor of MadgeTech precision data loggers and an ISO 9001:2015 certified company, Pacific Sensor Technologies can recommend a logger, supply it calibrated and support it locally. Contact the team for advice on your monitoring requirements.
Data logging is the process of automatically recording measurements over time using a data logger. Instead of someone writing down readings, the instrument samples its sensor at set intervals and stores time-stamped values that can be graphed, exported and audited later.
Many are. Standard indoor models are typically rated IP54 (splash resistant), while rugged models rated IP67 or IP68 are fully dustproof and can handle temporary or continuous submersion. Always match the IP rating to the installation environment.
Basic single-use and USB temperature loggers start around $100 AUD. Wireless and Wi-Fi models generally sit in the mid-hundreds, while multi-channel systems and validation kits range from roughly $1,000 to $3,000+, depending on channels, accuracy and software.
Every 12 months is the standard recommendation, or sooner if your quality system, auditor or application demands it. Loggers used for critical compliance records, vaccines, sterilisation, and export food shipments should never operate on an expired certificate.
It depends on the journey. Single-use USB loggers suit one-way shipments, NB-IoT loggers provide live tracking and alerts while goods are in transit, and wireless loggers are best for fixed cold rooms and fridges where instant out-of-range alarms matter most.
Yes. Wireless, Wi-Fi and NB-IoT loggers send email or SMS alarms the moment a high or low threshold is breached, while many stand-alone USB models flag breaches with an LED indicator and record the exact time of the excursion.
