EMF Meter, handheld digital Tesla meter high precision gauss meter magnetometer surface magnetic field tester - with one meter probe 0-2400mT range - and with N/S function (TD8620-5 Level)

I'm a Biomagnetic Therapist and I use this to make sure my magnets are of the right Gauss to be therapeutic. Reasonably priced.

I got this gaussmeter for hobbyist use, to test relative strength of magnets and do experiments involving magnetism. It was easy to use and worked decently testing various magnets. Display updated quickly, about ten times per second. The on-screen bar graph was useful for quickly scanning something to find where magnets are hidden below, or to find the highest point. The peak hold function was especially useful so I could scan probe over the surface then see the maximum field encountered. It has plenty of range, measuring 349 mT for a large 40x20 mm Nd magnet (out of its 2000 mT maximum). Lacking a calibrated magnetic test source, to test accuracy I zeroed facing magnetic north, then rotated probe around and got the expected reading equal to the expected magnetic field at my location; I got a 0.04-0.05 mT reading, matching the expected 0.046 mT listed for my location. The probe cover must be removed for proper readings, though left on I could still check N/S poles and get a general idea of stronger and weaker magnets (I put some markings on the cover so the sensor inside will be oriented properly). Meter build is pretty basic and has no stand. Instructions are decent, though don't detail which side of test probe goes next to magnet (TEST side faces magnet, ruler side faces you). This is an OK value, with fairly basic features.

Using it to check polarity and strength of magnets on my guitar pickups and it does the trick for me.

The meter worked great for about 3months. After 3months the unit still turns on, but displayed a constant reading. Likely the sensor is dead.

Picked this up to work on an electric guitar. 5% accuracy is close enough. The meter is very responsive providing quick readings. The autorange and autozero features keep one from having to fuss with adjusting the settings, one can right to work. The meters big LCD display with backlight is easy to read.It uses a standard 9-Volt battery that is included, not a "19"-Volt battery as listed in one of the product pics.A lifetime technical support and a 2-year warranty is comforting provided the company makes it. Hope they do, this is one nice meter to use.The probes cover needs to be taken off the hall sensor to get the correct calibarated reading. The probe under the cover is just a bare PCB board with the hall sensor at the end, no real support or protection for it when the cover is removed. These boards usually dont bend much before breaking. Keep the cover on when not in use and it should last with care, an avoidance of accidents, and curious young children.After looking at several of these, I feel the price is good for the features, warranty, and how well this works. Glad to have it on the bench.