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there will be a buttom on the tool turn on will beep if you have a good one with a light once on go to a power cord that is plugin to somthing put the tool to the cord it should beep and light up to tell you ther is power thereone side of the cord wont light up because there is a netrual there it will only light up when you hit powere or hot wire if it dosent work the batteries need to be changed i have a couple of these it will save you if you work on power lines good luck
On this model there is no fuse in case you test to high of a voltage. So My thoughts are maybe the small spring fell out when changing the batteries or ( I am not being smart ) you put the batteries in backwards. Also try another set of batteries and of course a circuit you know is live. Mine is 5yrs+ old and have never had a problem with it. If tis doesn't work they aren't that pricey I would just get another one.
It is detecting Residule voltage off the hot line, your common/Neutral should have no voltage. One thing I have noticed when using many non contacts if you are Holding a live wire (on the insulation)
I have gotten false readings (continous beeps) from the non-contact when checking neutral lines. Unsure as to why but something I have came across when trying to seperate wires while testing.
Grnite is SLIGHTLY conductive so if your counter top goes anywhere near live wires such as an appliance, you may sense it is hot with thaat detector. The stray field from the microwave is jumping onto the granite... HOWEVER please verify that your ground on the microwave is intact and returns to the third wire and has continuity to the case of your breaker box. If the ground is broken, that will certainly cause the indication. You can get one of those receptacle testers to test this.
ALSO NEVER trust the detector when safety is an issue. The device is "indication only" and it can be wrong for various reasons.
Hold the tester in your hand and you will see the on/off switch at the end of the tester. Make certain that the tester is turned to "off" and just below the word "off" you will see a small white dot. You will need to depress the white dot and while doing so turn the top part of the on/off switch toward that white dot. At the same time you will also need to pull that cap upward, like you would be pulling it off the tester, and you will see that it slides up and off. That is where the two AAA batteries are located!! Re-installing it is just the opposite of removing it.
Hold the tester in your hand and you will see the on/off switch at the
end of the tester. Make certain that the tester is turned to "off" and
just below the word "off" you will see a small white dot. You will need
to depress the white dot and while doing so turn the top part of the
on/off switch toward that white dot. At the same time you will also
need to pull that cap upward, like you would be pulling it off the
tester, and you will see that it slides up and off. That is where the
two AAA batteries are located!! Re-installing it is just the opposite
of removing it.
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