Looking for a Gaussmeter in a shop, I saw prices of more than hunderd Euro. There are just a few DIY magnetic field meter circuits on internet but of poor build. So, I designed one on my own. The circuit is simple to replicate with a Linear Ratiometric Hall Effect Sensor, the SS495A from Honeywell (2.50Euro). For the display I choose a mini digital panel voltmeter(2.50Euro). The window comperator is made with a LM339 IC. There is only one trimpot for the offset between the North (Red LED) and South (Green LED).
The Hall sensor I made on top of an aluminium tube; this probe can be separated from the box for tests at difficult places. A voltage read out on the display can easily be converted to the Gauss or Tesla units for magnetic induction or flux.
More info: www.laboratoiredesynthese.com
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