Bests & Worsts Reviews from Amazon

I'm giving this a 4-Star to start, if there are issues later I will update. So far, I think this is an excellent value. I paid around $33 and received free shipping. I examined all of the sensors and they arrived in good condition. I'm glad they were in plastic bags because several of them have tiny mercury switches, if any of the sensors had broken the bags would have contained them. Identifying the sensors can be a challenge if one has no experience with electronics, I'm a high school drop out so it was no problem for me. I made up a document that I can put in the lid which identifies each of the sensors by name and with an image. The images are really small, but, are good enough for me to identify most of the sensors easily. That was actually very easy, so, I'm not sure why the seller didn't do that. Maybe because packing the sensors in the right compartments is a pain? There are 37 sensors and 36 compartments, so, not sure about how that would work with labeling. There are more expensive sensor kits with similar labels to the one I built. I think I will add some pink anti-static foam to the compartments. There are some reviews that talk about breaking sensors, adding the foam would probably help. I'm not sure how much it would cost to die cut a few thousand pieces, the extra time to put the foam in would probably result in fewer returns and fewer low ratings, although, some people would complain about the foam :-) There are three Hall Effects sensors, the Linear magnetic Hall sensors KY-024 using the 49E-419 sensor (you are going to need a strong loop magnifier to read the markings on the sensors), the Hall magnetic sensor module KY-003 using the 3144 415 sensor and the Class Bihor magnetic sensor KY-035 using the 49E-419 sensor. the 3144-415 and the 49E-419 look almost exactly alike. The KY-003 has a resistor and an LED soldered on and the KY-035 doesn't. I actually received 2 of what appeared to be the same sensor, the Magic light cup module KY-027, I wasn't familiar with this sensor so I did a quick Google and found this: https://tkkrlab.nl/wiki/Arduino_KY-027_Magic_light_cup_module, which explains why you need two sensors. Some of the sensors seem kind of useless, like soldering a switch to a board. Switches a cheap, 20 4pin switch on eBay for a buck. Most of the sensors seem like they will be fun to play with and learn about. FYI: After reading about people complaining about not knowing what they bought or finding information on stuff I decided to post this image so people could complain that the pictures are too small, and the sensors aren't in alphabetical or numerical order or that I don't buy them flowers or whatever reason people have to complain. For example, there is a pretty good review that talks about never finding out what a light cup is, I ran a search on YouTube and found a tutorial on light cups posted back in 2009. Not sure when the review was written, I purposely didn't look, I'll give the person the benefit of the doubt and believe that they reviewed before 2009. If you aren't sure what you can do, just Google the name of the sensor. "Temperature sensor module KY-001", Try it with quotes first, and without quotes if that doesn't work, and see what comes up. Also, get a jewelers loop and read the designations on the sensors so you can find data sheets. Here is a link to info on these sensors. http://linksprite.com/wiki/index.php5?title=Advanced_Sensors_Kit_for_Arduino