Gauss Meters & Magnetometers

DigiGauss DG1

Digital Magnetic Field Indicator

Pocket Magnetometer

Designed by Johnson & Allen the DigiGauss DG1 is a digital update of the older mechanical deflection type magnetometer field indicator built to measure residual magnetism after demagnetising.

Verifying adequate demagnetisation has taken place is an important process as residual magnetisms left in critical components could negatively affect their performance.

The OLED screen is easy to read even in the darkened conditions of a typical fluorescent magnetic particle inspection environment.

Display Modes

Magnetometer ±20 Gauss deflection needle display with a black background which mimics older analogue devices.
Quick Scan 1
(±2G Trip)
Deflection needle display with blue background which becomes red when Gauss level exceeds a ±2 Gauss trip.
Quick Scan 2
(±5G Trip)
Deflection needle display with blue background which becomes red when Gauss level exceeds a ±5 Gauss trip.
Quick Scan 3
(±3G Trip)
Deflection needle display with blue background which becomes red when Gauss level exceeds a pre-programmed level - Default ±3 Gauss trip.
Large Digital 
±20 Gauss display with the measurement displayed in large numbers.
Battery Level 
Shows the remaining battery level.


'Quick Scan' - Gauss Trip Function

With a similar size, shape and feel as its mechanical counterpart, the DigiGauss DG1 boasts a number of benefits from being a digital unit while still retaining a high level of familiarity.

One key benefit is the Quick Scan - This is a Gauss trip function where by the background becomes red to notify an operator when a Gauss reading exceeds a pre-programmed value - Typically 2 or 5 Gauss.

A customised level can also be programmed on request for customers with unique applications - By default this additional trip level is set to 3 Gauss.

The Gauss trip function ensures that areas of high residual magnetism are not missed by operators as a clear change in colour is easier to see than a slight needle movement. Particularly when mechanical deflection type field indicators are susceptible to errors from them being physically moved by operators during the inspection process.

The DigiGauss DG1 can also display readings in the form of a large numerical display for operators who dislike needle metering entirely.

DigiGauss DG1 Gauss Trip FunctionDigiGauss DG1 Large Numerical Display

Magnetometer Calibration

The DigiGauss DG1 is individually serialised and supplied calibrated as standard.

Calibrations are in keeping with national standards which includes fully traceability.

Below are the calibration ranges available - For other ranges please contact the Johnson & Allen Calibration Laboratory to discuss your precise needs.

  • 20 - 0 - 20 (Standard)
  • 10 - 0 - 10
  • 5 - 0 - 5

The DigiGauss DG1 displays the unit’s serial number and the date of the last calibration upon on start-up. Johnson & Allen recommend that equipment be calibrated at least once every 12 months.

Zero Chamber Function

The DigiGauss DG1 is supplied with a zero chamber – A ring containing mu-metal which shields the meter from external magnetic fields such as local magnetic fields and the Earth’s natural background magnetic field.

Because field indicators by their nature are exposed to magnetisms, the potential arises for residual magnetisms to be picked up by the batteries over periods of heavy use. Particularly if units are inadvertently exposed to large magnetising fields by accident which would normally damage mechanical units.

The zero chamber function included with the DigiGauss DG1 allows the unit be zeroed within a number of seconds - Without invalidating the last calibration.

Product Data

  • Gauss trip function – Background becomes red to notify operator when a reading exceeds 2G, 5G or a customer defined Gauss value (Default 3G)
  • Full colour 160 x 128 OLED display with adjustable brightness.
  • Easy to read in darkened conditions. 
  • Retro deflection needle display mode.
  • Large numerical value display mode.
  • Single index button - Simple to use.
  • Battery gauge function.
  • Uses easily to obtain AAA batteries – Supplied with 2 x 1.5V batteries.
  • Zero Chamber function to negate internal residual magnetism - Zero chamber included as standard.
  • Aluminium construction - Robust construction with gasket seals to retard fluid ingress.
  • Electronic unit not damaged by excessive overloads like mechanical units.
  • Fully calibrated for measuring residual magnetism and supplied with relevant paper work.
  • Digitally displays last calibration date and serial number on start up.


What is included?

DigiGauss DG1 1 OFF
1.5V AAA Battery 2 OFF
Zero Gauss Chamber 1 OFF
Operator Manual (ENGLISH) 1 OFF
Calibration Certificate (ENGLISH) 1 OFF
Plastic Carry Case 1 OFF


Technical Specification

Display Resolution Full colour 160 x 128 OLED display
Sensors 4 x Hall Effect Cells
Construction Aluminium Housing
Dimensions 65mm Diameter x 37mm
Weight 150 g
Calibrated Range ±20 Gauss DC (Standard)
Calibration Type 20-0-20 (Standard)
Resolution 0.1 Gauss Increments
Sampling Frequency 30.5 Hz
Sampling Range 20 kHz
Battery 2 x 1.5V AAA Batteries
Battery Life 10 Hours (Typical)
Ingress Protection IP54
Storage Temperature 5 to 20°C (Recommended)
Operating Temperature 0 to 30°C
Warranty 12 months
Origin of Manufacture UK
Conformity UKCA


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