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DTM333 (front).png


  • Resolution of 1 part in 12,000

  • 4 ranges

  • 3 channels

  • Maximum field 3 Tesla

  • Integrated touch screen

  • On board or remote data acquisition

  • USB data storage option

  • optional Ethernet or RS232. 

  • Accuracy is ± (0.03% of reading + 0.03% of full scale) with 3DT-132, LPT-130 or MPT-132 probe

Ordering Guide

D T M     -    3 3 3     -     P        N

Product Initials

DTM - Digital Teslameter

Series Model



D - Bench Top

P - Panel Mount

333 - No Temperature Compensation,
3-Channel, Touch Screen Display


N - Network

Digital Teslameter unit, touchscreen interface, serial communications, for temperature compensated and non compensated probes.


The DTM-333 is a new generation of Digital Teslameter/Gaussmeter but includes the same tried and tested reliable technology used in previous versions.  The technology and accuracy is the same as the Group3 DTM-133 but in a 3D or 3 Channel environment. We have taken great care to ensure the product is backwardly compatible in all ways. There is no need to buy new probes if you already have some - the DTM-333 can accept all models of Group3 Hall probes. 

The new DTM-333 has 2 main operating modes - Axis (3D Mode and Channel Mode. In Axial mode the 3D probe is used (3DT-130 or 3DT-230). This means the Teslameter operates exclusively as a combined 3 axis instrument. When a mode is changed ie. range is set to 1 then all axis follow similarly when zeroing. In channel mode each channel is able to be operated independently of the other allowing the user the flexibility of 3 separate channels for 3 separate tasks including being able to use different specification probes. This means the DTM‐333 is a very flexible instrument.


DTM‐333 performance summary when combined with the listed probe.


Probe resolution of                             Max. Field                                  Finest                          Accuracy at                               Zero Drift   

3DT­‐132 1 in 12,000                                3 Tesla                                      50µT                             ± 0.03%                                        ± 40           

3DT­‐230 1 in 12,000                             0.3 Tesla                                      5µT                               ± 0.03%                                        ± 8                     

Absolute Accuracy:

± 0.03% of reading ± 0.03% of range at 25° C

Temperature Stability with LPT‐130 probe

  • Scale Factor: -80 ppm of reading / ° C max.

  • Zero drift: ± (12m T + 0.0015% of full scale ) / ° C max.

  • Effect of probe cable: Add -3ppm / ° C for each metre of probe cable.


Temperature Stability with MPT-132 probe

  • Scale factor: ± (40m T + 0.0003% of full scale ) / ° C max.

  • Zero drift: ± (15m T + 0.0010% of full scale ) / ° C typical. ± (40m T + 0.0015% of full scale ) / ° C max.

  • Effect of probe cable: add -3ppm / ° C for each metre of probe cable.



DC, or in AC mode 8 to 3,000 Hz.


  • Temperature coefficient is 80 ppm / ° C when used with LPT-130, or 140 ppm / °C when used with MPT‐132 or 3DT-132 probe.

  • Accuracy and temperature specifications include performance of probe. Because the probe characterisation information is stored in the probe assembly itself, any Group3 probe can be used with any Group3 DTM.

  • Digital filtering (time averaging) can be enabled to suppress short term fluctuations. An analog output is available. This is a buffered version of the raw probe signal, and is not corrected for linearity or temperature. It offers an instantaneous field value, (0 to 9kHz). Panel mount versions are available.  The operating temperature range of the probe and instrument is 0 to 50 °C.

The display is a touch screen environment with an intuitive layout and design. Function buttons are illuminated to show their state. This means the user is able to see operating modes at a glance.

DTM-333 Home Tab.png

The DTM-333 had a built in real time graph allowing the user to monitor any fluctuations in the field over time without having to check and analyse streaming data for fluctuations. Obvious noise and robotic movement can be seen at a glance alerting the user to any possible issue with the tasks currently being performed. It is also a useful tool for quick setup before logging any data. The Graph has an adjustable time base of 10 seconds to 6000 seconds. The graph function mirrors that of the settings in the home menu so both Axis and Channel modes are set in the main home screen.

The DTM-333 Master functions menu is for the advanced user needing to access the base function of the Teslameter.

These functions remain as part of previous versions of DTM-­133 and DTM-­151 so legacy users have some tools that identify the functions. They are also useful for displaying uncorrected data on other functions such as letting the user create a custom offset and reading back user zero and calibration factors. All functions of the DTM-133 are present in this menu system allowing the user a level of familiarity and full functionality based on previous models. The menu system is labelled so functions are obvious with intuitive pop-up sub menus.

The DTM-333 has a new and very flexible data logging system. By inserting a Hard Disk drive or Memory stick in any one of the 2 USB ports provided data logging is instantly available. The system calculates how much logging time you have based on 10Hz output. Even with as little as 2Gb the system can provide 20 days of logging time. Logged data consists of DATE:TIME stamp CHANNEL/AXIS stamp and FIELD per Channel/Axis. Features include instant start logging. This means the user can just press start and logging will begin until cancelled by the user. The system can also do pre-determined timed sessions able to be pre-programmed with start and stop times.


Provided there is enough storage then there is no limit to how much data the user can store. 

When the user has the ability to adjust the clock at any time so is able to be synchronised to other equipment in the chain. Various data sets present on the storage device can be removed using the touch screen by touching on a session and deleting it. Data sessions are automatically named and no two will ever have the same name. Data is saved in a popular .CSV format and can be instantly converted into graph data  without the need for tedious ASCII conversion and data collation.

Recommended Probes for DTM-333 Teslameters 




(0.3, 0.6, 1.2, 3.0 Tesla)




(0.03, 0.06, 0.12, 0.3 Tesla)

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