Gemini Data Loggers (Tinytag)

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Scientific House
Terminus Road
PO19 8UJ
Conservation,Data Loggers,Environmental Monitoring and Control,Humidity and Moisture,Temperature Measurement


Tinytag temperature and relative humidity data loggers accurately monitor conditions that can affect materials on display and in storage, and also in historic buildings/sites. They can play a key role in conservation by helping to maintain a stable environment.

Tinytags are robust, easy to use and cost-effective, and can be left to record for long periods. They can be supplied in unobtrusive colours so as not to detract from exhibits. They are very flexible – loggers can be moved easily, or new units added, to monitor different locations e.g. if items/exhibits/displays change. Versions with external probes are available for sealed display cases, to allow data to be retrieved without opening the case.

Stand-alone data loggers are left to record as required, and data is downloaded via a USB cable to a PC for analysis.

In sites requiring remote data access or with multiple monitoring points, Tinytag Radio and Plus LAN data loggers are an ideal solution. Radio loggers collect data automatically using wireless communications, and send it via a receiver for direct viewing on a PC or across a LAN. Plus LAN data loggers plug into a network point and send data directly for viewing by any permitted user on a network. Plus LAN loggers are ideal for applications where radio signals may be problematic due to range or physical obstructions, wherever a convenient network point is available. Radio and Plus LAN loggers can be mixed and matched within a system, and as well as monitoring temperature and humidity, units are available to monitor count, which can provide footfall data.

Recorded data is initially presented as graphs and tables in Tinytag Explorer, an easy to use Windows program. Data can easily be exported to popular software packages and results from separate logging runs can be combined for comparison and analysis.

Tinytags are manufactured in the UK by Gemini Data Loggers.


Specialist News


Gemini helped us identify exactly what we needed and how the radio system would work best for us, and what we could achieve within our budget. The after sales service has been brilliant, there’s always been someone available to help.

Margaret Harrison, Collections Manager Canal & River Trust

Tinytags are easy to use and provide detailed readings that are invaluable for maintaining the best possible environmental conditions for our collections. They have a long battery life, and their discreet design means they aren’t noticeable when located in the gallery.

Samantha Bannerman, Curator ,St Andrews Preservation Trust Museum

Tinytags proved easy to use, flexible and suitable for our display spaces, so we have continued to use them. They provide all the information I require to manage and care for my collections appropriately.

Leeanne Westwood, Curator Valence House Museum

Key reasons for choosing the Tinytag were simplicity and ease of use. As with any volunteer run organization a major problem is making sure that all staff can understand and use it for the sake of continuity.

Mike Creagh, Archive Volunteer Barrow Hill Museum

I am impressed by the significant amounts of data that can be stored by the loggers and am completely satisfied with the efficiency of the calibration service offered by Gemini Data Loggers.

Jane Demet, Museum Management Group Volunteer Rushden Transport Museum