10Pcs Reed Switch Normally Open (N/O) Magnetic Induction Switch Electromagnetic for Arduino (Pack of 10) CYT1004

for the most part, the switches seem to be very good. as i have noticed in other reviews, you have to test the switches first when they arrive. of the 10 switches i received, 4 of them did not work properly. i contacted the seller, and they promptly issued a partial refund, which is exactly what i requested. i didn't need all 10, so i couldn't see any reason to return the order and get a replacement. i have already installed the switches that i needed, and they work perfectly. as a side note, not all reed switches have exactly the same magnetic sensitivity, so check all your distances before closing up whatever you are fixing. also, do not assume that a switch isn't working if you install it in the original position. i had to adjust the position of my replacement switch about 1/32" further away from the magnet than from the original.

The ten reed switches were packaged in a zip-lock type bag which was in a small plastic box. Good protection for mailing since these switches are tiny and fragile. I tested all 10 pieces upon arrival and they all had contact resistances less than 1 ohm when closed with a small magnet. As shown in the attached photos, I used one switch to replace a reed switch, in an Acurite rain gauge, that failed to close when activated by a magnet . Precautions were taken when bending the leads to fit in the printed circuit board. The excess leads were trimmed only after the switch had been soldered in place. The new reed switches were easily activated with the small magnet on the rain gauge's tipping bucket and the gauge now works perfectly.

Awesome little switches. I purchased these for a little 3d printed 22re engine. The switches work great near a magnetic field, but be sure to verify they do work. Please be careful, the glass body looks good but break very easily. I broke several while trying to get them into my 3d print and at one point I had a piece of glass go into my eye. This was my fault and not the products, just be careful if you are near sighted like me.

This device is as shown and works well. My application required a lead bend radius. There's no data sheet I could find and the first attempt broke the glass body but with the quantity that wasn't an issue. The body is more delicate than the original so some care should be taken should you need to bend the leads.

I'm using them for a 5 volt, 4 mili-amp application. As of this review, it's about 20,000 cycles in with no issues. I'm trying the first one without a capacitor, and it seems to be doing fine. I'm sure it will eventually degrade, and the next one will have a cap. My application is using a stack of neo-mags. The switches are quite sensitive and require some distance. They arrived well packaged, and in good shape.

These switches have a mind of their own, I've tested them with multiple arduinos and a multimeter, well below their supposed limits, every single one failed, the majority stay stuck closed, sometimes will open if you bump it hard enough. Sometimes it will start working properly if you bump it in the right way but bump it again and it will once again stick closed. Thinking I could get some working consistently if I bent them enough, I tried bending them and had limited success but eventually broke nearly all of them, fine they are fragile, my fault, but I shouldn't need to bend these to get these working.

When using one of these I have most luck using a tiny round magnet and positioning it at one end or the other, not in the center. A large magnet may magnetize the leads and make them stick closed so a very small magnet (especially if using neodymium type) is best. Positioning the magnet at an end allows one lead (contact) to become temporarily "magnetized" drawing the other contact towards it which seems to work best based on my experience with these things. A long magnet with n/s poles should be placed in center, which essentially turns the switch and it's contacts into a magnet, drawing both contacts together.

It works great! Just what it was intended to be.

I used the product to repair the speed sensor on a thread mill.

As others have said about these and similar glass enclosed reed switches fragile & highly variable response. One works consistently at more than 1cm distance (neodymium). Most respond at more like 3mm. A couple duds. Seems to be the way of this switch type.

Bon produit à bon prix!

Like others, found that you need to be very careful while using these, due to being fragile. So far, I have found 3 out of 5 that are not working properly. From what I can tell, the sensitivity seems to be lowest right in the middle of the device. I should have read the comments first, and bought something more robust and reliable!