Perhaps our review will help you establish that. So, make sure you stick with us till the end!

About The Product

It is implied that National Geographic is a top manufacturer when it comes to rock tumblers and similar science-oriented items. They engineer products suitable for both individual and commercial use, being renowned for their quality and reliability.

Essentially, this kit is a good example of the company’s legacy. What should you know about it? The kit contains a tumbler, sifter, four polishing grits, learning guide, and nine different types of rough gemstones.

The Results

Whoever said that you can’t get a high-quality, sturdy rock tumbler for less than $100 was wrong. This unit demonstrates that. To begin with, the barrel has a stainless steel cover, which is the ultimate guarantee of its durability.

The 1-lbs. capacity is rather small, but beginners and children might still find it suitably sized. It all depends on your need and the way in which you intend on using the machine.

Of course, we like that the unit is engineered so that it emits as little noise as possible. Most rock polishing hobbyists are aware that most units are noisy; therefore, you shouldn’t expect not to hear this at all during its operation.

At the same time, the smart engineering prevents leakage incidents, which is just as important. For instance, as the machine functions on its own for weeks, leakage incidents could easily go unnoticed, which is why this feature is of great importance.

Plus, since you get nine types of different gemstones, you can really get to work the minute after you unbox the machine. So, if you’re eager to give it a run, this is great.

If you’re interested in jewelry making, you will definitely find the jewelry fastenings to be handy, as well. What is more, the automatic shut-off timer will definitely help you to save on energy costs. Plus, this plays a role in extending the lifespan of the rock tumbler.

Considering that the size of the barrel is rather small – 1 lbs. – we would recommend this to hobbyists that are just starting out to tumble rocks. Otherwise, you might be disappointed by this unit’s limited capacity.

What Others Say

As a rule of thumb, we always look for customer reviews before making an important purchase. And it would be safe to say that a rock polishing unit is a significant investment.

That being said, we weren’t a bit surprised by the high number of customer reviews we could find, or by the high ratings. This is definitely a nice unit and both the reviews and ratings reflect that.

Some people indicated that this unit is best suited for children. And this may be true – due to its small capacity. But this isn’t necessarily the case. If you’re a hobbyist on a budget, you won’t be disappointed by your purchase, as long as you can deal with the 1-lbs. barrel capacity.

On the other side, in spite of the noise minimizing design, we noticed some complaints regarding the noisy operation of the unit. Still, this isn’t a fault of the product, as it is something that is implied with most rock tumblers on the market.

What We Liked

If we had to list the things we enjoyed most about this National Geographic Rock Tumbler Kit, the first thing on the list would definitely be the price-quality ratio. It is an excellent budget choice for both children and beginners.

The instructions included by the manufacturer can be really helpful if you’ve never used such a machine beforehand. Plus, the fact that it is lightweight comes as a pro, since you can easily carry it around – even children can do that effortlessly.

Concurrently, the fact that you get a complete, comprehensive kit is another thing we like. In fact, this makes the unit a great idea for a present.

What We Didn’t Like

On the other hand, the unit is a bit loud. While this isn’t necessarily an engineering fault, it can be an annoyance to some people. This also depends on the place where you plan on using the machine. If your insulation is decent, then you shouldn’t be too bothered by this.

At the same time, we noticed that the unit has the tendency to overheat. Therefore, it might be recommended to pause the machine every now and then. It goes without saying that this will make the polishing process last more than you’d want.

Buying Advice

We’ve already mentioned a couple of times that this unit is among the best rock tumblers under $100. And we stand by it. Plus, Amazon has some great discounts if you get it from there – we received a 7 percent discount, which isn’t a lot, but is still something.

The 2-year warranty, as well as the money-back guarantee, offer peace of mind.

Final Thoughts

In summary, you have learned by now that we really enjoyed testing and reviewing the National Geographic Hobby Rock Tumbler Kit for you. Nevertheless, most importantly, we are hopeful that it will help you in the time-consuming shopping process.

This tumbler kit is an excellent product manufactured by a reliable company; it is the perfect gift – regardless of the occasion – and the price is on point. What more can you ask?

Don’t worry, even if you don’t know anything about this product, our review will shed some light on the subject.

About The Product

Before we proceed with minutely presenting our impression of the product, we’d like to enumerate its primary characteristics. So, why did this unit reach our list?

You get a complete tumbling kit including a tumbler and barrel, 4 grades polishing grits, nine different types of gemstones, jewelry fastenings and learning guide.

The Results

Discover with Dr. Cool is a renowned manufacturer whose focus is to engineer science-orientated products designated for kids. And this is the case with this rock tumbler as well. As the manufacturer puts it, this unit is ideal for children up to fifteen years old.

For starters, you get the complete rock tumbling kit, as mentioned beforehand. This means that the user can commence the geology journey right away. Of course, considering that it is targeted for children, the bright side is that operating it is a breeze.

Still, you should pick the rocks carefully, if you want to obtain great results. Evidently, some rocks will be polished better than others. It’s worth noting that rocks with cavities and pores aren’t appropriate for the process – as this might make them get blocked in the pores.

As for the whole duration of the tumbling process, it takes up to four weeks – more or less. This is the norm for most rotary rock tumblers. Each grade of grit has to be used for roughly one week. Since there are four different grades of grit, in about one month, you should be done.

At the same time, you can attempt to reuse the grit. In time, though, it will get finer, which will require you to replace it eventually.

Since this product is engineered for children, it is surprisingly well-made. Most units that are made for younger users have a toy feel to them. Fortunately, this isn’t the case for this rock tumbler by Discover with Dr. Cool.

Also, due to the rubber barrel, the noise level is significantly reduced. As a word of reference, rubber barrels are much quieter than plastic barrels; so you should bear this in mind when you’re shopping for rock tumblers.

Concurrently, the pre-set duration setting is a great addition. It allows you to program the tumbler for the number of days you’d like for it to run. The fact that you can analyze the transformation process of the rocks is definitely pleasurable and educative, which is the whole purpose of getting a rock tumbler for kids.

What Others Say

Most people specify that this is a fairly affordable rock tumbler that works great for the money. And we couldn’t agree more with this statement. The fact that you get a complete kit is a major plus, especially for the price.

Plus, this is great due to its convenience, as noted by other customers. It was also pointed that the unit is easy to clean and maintain, whereas the noise level isn’t too harsh. On a different note, the noise and vibration released are influenced by the type of rock or gemstone you introduce in the barrel.

Simultaneously, other users noted that this can be used by adults as well – which is nice to know. Therefore, if you’re looking for an affordable unit for beginners, this one might be a decent pick.

What We Liked

We really like that this unit offers a fantastic price-quality ratio. At the same time, we would say that it is a suitable choice for both beginners who don’t want to spend a small fortune on a rock tumbler and children.

Also, it operates surprisingly quietly – primarily due to the leak-proof lid and premium rubber. It doesn’t come with a lot of bells and whistles, but it does the job. It is the right equipment if you want good results.

What We Didn’t Like

It will be a while till we’ll manage to find the perfect product – if you found it, do let us know. That is to say, this unit, although it is a great purchase, has a small design flaw.

To be more specific, we noticed that the belt spinning the tumbler has the tendency to come off, which could be rather annoying.

Buying Advice

The manufacturer offers a 100 percent satisfaction guarantee, as well as a 2-year warranty. As for the price point, this unit costs less than $100.

If you’re lucky – like we were when we placed the order on Amazon, you’ll obtain a discount as well. We got a 5 percent price reduction plus free shipping.

Final Thoughts

To conclude, we wanted to include the most important points about the Discover with Dr. Cool Hobby Rock Tumbler and we are confident that we’ve reached this goal. Once again, we’d like to outline that this unit is great for children, but beginners might find it a nice piece of equipment to start with.

At the end of the day, it doesn’t make sense to invest a large sum of money before you know for sure that you’re genuinely interested in rock polishing.

Still, you don’t have to do that, considering that we’ve done all the legwork for you. Our reviews aim at objectively presenting the item’s features, while outlining our personal experience with it.

Without further ado, let’s see whether the National Geographic Professional Rock Tumbler is worthy of your attention or not!

About The Product

If you prefer choosing a rock tumbling kit over a rock tumbler, then you might have found your pick – this unit by National Geographic comes with everything you need to get started. Aside from that, here are the main product specs.

The kit includes one pound of rough gemstones, jewelry fastenings, four polishing grits, information guide, and instructions.

The Results

There are many reasons why this unit has come to our attention. For starters, it definitely offers a nice mixture of unique features. For one thing, the automatic shut-off timer might come in handy whenever you are away.

Considering that the rocks have reached the right tumbling process, the unit will simply automatically shut off. That being said, since few people have the time to keep on monitoring the tumbling stage, this feature can be really helpful.

Moving on, thanks to the speed control feature, you may pick the desired tumbling speed. This way, you can anticipate when it’s likely to finish the job.

Essentially, we find that the inclusion of one pound of rough gemstones is more than welcome. This will give you a great start on things, meaning that you can begin using the tumbler right away – as opposed to looking for rough stones to polish.

Furthermore, we consider that the noise-reduction design is an excellent innovation. Evidently, this doesn’t mean that you won’t hear this unit operate. All rock tumbling units are loud – this comes with the territory.

Nevertheless, this unit is definitely quieter than others, which is a pro. That is to say, considering that your garage insulation is decent, you might not even hear it tumble round the clock.

Since you also get jewelry fastenings, this means you can use them for your first jewelry making projects – considering that you’re just starting off. Who knows, perhaps this will motivate you to discover an innate talent for jewelry making?

At the same time, we find that the leak-proof, high-impact design plays a crucial role in maximizing the durability of the item. Therefore, you should get a lot of use out of this product, if you utilize it accordingly.

A thing worth noting is that even though the manufacturer advises seven to 10 days for polishing, you can only set the timer for up to five days. This means you’ll need to reset the timer.

On the other side, the rubber and metal lid is a tad challenging to remove. Still, once you get the hang of it, there shouldn’t be any problems. 

What Others Say

According to former customers, this unit is excellent for beginners, even children. The fact that it comes as a complete starter kit is quite appealing, as well.

At the same time, customers outlined that the unit does a decent job at polishing all types of rocks, which is the mere purpose of getting such a machine, right?

On the other hand, it appears that some customers received defective products. That means that there might be an issue with the quality control stage of the items. Perhaps the manufacturer should do something in this respect, to minimize the likelihood of sending out defective units.

What We Liked

The thing we liked most about this rock tumbler is the fact that it has some great advanced features. It goes without saying that the speed variation and timer are its most notable characteristics, allowing you to fully customize the operation of the machine.

Secondly, the leak-proof design of the barrel does a decent job at preventing water from getting in during the operation. Novice hobbyists will also find the included educational pamphlet really helpful, as it presents a wide range of details regarding different rocks and tumbling techniques.

Although there’s no rocket science there, it’s nice to have all the information in one place.

What We Didn’t Like

A potential disadvantage of this unit is that closing and opening the rubber and metal lid is a bit of a challenge – at first, at the very least. In time, though, it should get easier.

Plus, the fact that some customers received defective units is a bit disappointing, considering the legacy of the manufacturer.

Buying Advice

Depending on your budget, you might think that this unit is either on the affordable or on the expensive side. We believe that it is fairly priced, since it does have a nice set of features. If you order it on Amazon, you pay less than $150, plus free shipping.

On a different note, though, National Geographic offers a 100 percent satisfaction guarantee, as well as a 2-year warranty.

Final Thoughts

So, if you’re on the lookout for a high-quality rock tumbler that would do the job effortlessly, it’s needless to say that the National Geographic Professional Rock Tumbler fits the description. Evidently, this isn’t a perfect unit, but it comes pretty close to being one.

Thanks for reading so far, and make sure you leave your thoughts and impressions of the product if you’ve already used it!

That being said, if you are clueless regarding the rock polishing device you should pick, perhaps our review of the Tru-square Metal Products Heavy Duty Rotary Tumbler will guide you in the right direction.

We’ll briefly present the main characteristics of the item to make sure that you make an informed purchase.

About The Product

As the name already implies, the product we’re about to present to you is a rotary tumbler. What does this mean? When you use this kind of machine, you place rough rocks in the barrel; from that point onward, the barrel will continually rotate the rocks, while smoothing the edges.

As a rule of thumb, when you shop for a rotary tumbler, you’ll get rounded rocks. This makes such an item more than ideal for jewelry making.

At the same time, beginners might find rotary tumblers suitable, because they are easier to use than their counterparts – vibratory tumblers. Now that we’ve clarified that, let’s have a look at the key features of this product, shall we?

The Results

To start with, this is a unit that indicates high-quality and first-rate craftsmanship. We specifically like that it is suitable for the majority of rock tumbling applications. To be more specific, the 15-pound capacity will accommodate the needs of most hobbyists.

For instance, smaller units are capable of shaping rocks whose diameter is of one inch. Nevertheless, if you’re serious about your tumbling goals, we believe that this unit will meet, if not surpass, your expectations – as it did in our case.

After conducting a series of tests with this unit, we could wholeheartedly recommend it to all rock polishing hobbyists out there and collectors. It might be appropriate for equipping schools and laboratories, as well – considering the durable build of the item.

Additionally, it is engineered so that it can accommodate all types of rocks – which is always an advantage. At the same time, it is quite easy to operate, which would make it a suitable investment for both beginners and more advanced users.

Moving on, we were definitely keen on the motor’s powerful operation. Nonetheless, carry in mind that the speed setting isn’t variable – this could be a source of disappointment for some users, but still, it’s nothing major.

Also, as we tested the tumbler with rocks of different sizes, we determined that one shouldn’t place rocks whose diameter is larger than three inches. In this respect, the rule of thumb is to avoid adding rocks that are larger than half of the barrel’s diameter. So, regardless of the product you pick, you should keep this rule in mind.

You should also remember that the barrel must always be filled at least ½ to 2/3 full capacity. In the case in which you don’t have sufficient tumbling material, you might consider getting ceramic media to compensate.

On the other side, you must note that this isn’t a rock tumbling kit – meaning that you need to buy all the additional accessories separately. This could be an inconvenience to some people; however, we find that for the quality of the item, the price is on point.

At the same time, the fact that you need to purchase grit isn’t too bad. It merely means that you can fully customize the equipment you purchase depending on your personal applications.

What Others Say

Evidently, customer reviews can indicate whether a product is worth the purchase or not. This is why we took the time to scan through reviews, and, for the most part, we’ve noticed that most people are happy with the product.

It appears that not only is this unit suitable for rock tumbling, but many people use it for polishing brass. Therefore, if you need a unit for this application as well, then you might have found your pick.

As for its general rating on Amazon, it is above 4 stars, which could only mean that we’re dealing with a high-quality unit. Most people outline that the unit is reliable and is likely to bring the anticipated results. The fact that it is sturdy and well-built is often mentioned in reviews.

On the other side, some users believe that the motor is underpowered for a 15-lbs capacity. Additionally, the fact that it is rather noisy to operate is widely agreed upon.

What We Liked

As we’ve pointed beforehand, this product comes with a nice set of features. The overheat protection is definitely a plus, ensuring that the motor doesn’t fail.

At the same time, the rubber liner facilitates easy cleaning, which is just as important. Of course, the item’s durable construction is worth mentioning, as well.

What We Didn’t Like

Moving on to the not so good things about this unit: it is, as former customers outlined, rather noisy. Therefore, it is pretty mandatory to use it in the garage, or any other well-insulated place – unless you’re a fan of the noise. What is more, if you don’t handle them accordingly, the side plates are prone to bend.

Buying Advice

Amazon is usually the site where we place online orders. And we did the same for this rotary tumbler. At the time of the purchase, we got free shipping and a 32 percent discount, which is not too bad.

Final Thoughts

All things considered, this is a great unit that is likely to address the needs of most rock tumbling hobbyists. It does the job, it has a sturdy construction, and you may use it for a wide variety of tumbling applications. If you’ve already tested this unit, do share your thoughts with us in the comment section!