LogTag Data Loggers

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Which LogTag probe do I need?

LogTag Probes

There are a range of probes available for your LogTag. There are various widths and lengths. This guide will help you choose the right probe for your needs.

Standard LogTag Probes

Temperature range: -40°C to +99°C

LogTag ST100J Probe

Type J (ST100J)
40mm tip length, ⌀3.2mm

This is the probe that goes with the LeakProof Vial

Type K (ST100K)
65mm tip length, ⌀3.2mm

LogTag ST100L Probe

Type L (ST100L)
90mm tip length, ⌀3.2mm

LogTag ST100S Probe

Type S (ST100S)
30mm tip length, ⌀5mm

LogTag ST100T Probe

Type T (ST100T)
140mm tip length, ⌀5mm

 

LogTag ST100H Probe

Type H (ST100H)
Handled with 105mm tip length, ⌀5mm

 

LogTag ST100B Probe

Type B (ST100B – Untipped)

Bare sensor without stainless sheath ready for fitting to custom probe assembly.

Not rated for food contact or environmentally rated.

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Low Temperature External Probes for LogTags

-90 °C to +40 °C (-130 °F to +104 °F)

LogTag ST10S Probe

Type S (ST10S)
30mm tip length, ⌀5mm

LogTag ST10M Probe

Type M (ST10M)
65mm tip length, ⌀5mm

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Latency explained

What is latency?

Latency, when it comes to temperature logging, refers to the delay between a change in temperature and when that change is detected and recorded by the logger. This delay can be due to the sensor’s design, the materials it’s placed in, or the logging interval. While it might sound like a disadvantage, latency can actually serve a useful purpose in certain environments—particularly where short-term temperature spikes are common but not harmful.

For example, in a busy commercial fridge, the temperature may briefly rise every time the door is opened. A logger with high latency won’t immediately react to these short fluctuations, helping to avoid unnecessary alarms or false data indicating a problem when there isn’t one. In these cases, a slight delay in response acts like a filter, focusing attention on real issues—such as prolonged exposure to unsafe temperatures—while ignoring the everyday ups and downs that don’t affect product quality or safety.

Differrnt connections

Connecting your logger

Depending on the type of logger you have, connecting your logger to your PC means either:

  • inserting into the Reader,
  • plugging it into a USB port, or
  • connecting it via a USB cable.
comparing gen1 and gen 2

What's so good about USB?

First Generation LogTags use a separate Reader (sometimes called a dock) for configuration and for downloading recorded data. 

The Second Generation loggers only require a USB port or cable. Apart from saving the cost of the Reader, this makes them much better suited for shipping, because the recipient doesn’t need a LogTag Reader to download a report about the shipment’s journey.

comparing gen1 and gen 2