g vape pen instructions

Review: The New G Pen Pro Portable Vaporizer from Grenco Science


  • Manufactured By: Grenco Science
  • Manufactured In: China
  • Designed In: California
  • Designed For:
    • Dry Herb
See all specifications

Grenco Science, the company behind the original G Pen vaporizer, has quickly established itself as one of the largest and most well-recognized portable vaporizer manufacturers in the world. With celebrity endorsements from Snoop Dogg, Taylor Gang, DGK, and more, Grenco continues to look for ways to expand its reach and connect with the community; so far, the company has found a bundle of success.

The G Pen Pro is the company’s newest product offering and is the next generation of the original G Pro Herbal, a less-sophisticated vaporizer pen launched by Grenco in early 2014. Like the G Pro Herbal, the new G Pen Pro is designed specifically to vape dried herbs (not concentrates or liquids) and retails for the relatively low price of $99.95 USD.

Before we dive into the full review, I think it is important to note that the G Pen Pro is a “session” vape that stays heated for the entire life of the session, as opposed to a single-hitter that requires you to press and hold a button each time you want to take a draw. Naturally, this makes the G Pen Pro a decent option for those who like to take a lot of draws per vape session, and a less attractive option for those who prefer just 1-2 hits at a time. If you prefer the latter, you may want to consider browsing Medical Jane for other quality [single-draw] vaporizers.

New Stylish Looks, Same Old Materials & Internal Workings

As is typical for Grenco, the company has taken steps to ensure that the newest addition to their product line is aesthetically pleasing. If you are looking for a pen that has a nice feel in your hand, and is small and light enough that you can carry it around discretely in your hand or slip it into your pocket for a few hours without much thought, then you are going to love the new G Pen Pro. It certainly looks chic and stealthy – some may even go as far as calling this vaporizer sexy.

But if you are looking for new features or advances in technology, the G Pen Pro isn’t going to excite you. I was happy to see a shortened heating time with the new pen; however, other than that and making the device a bit smaller, lighter, and better looking than its predecessor, it certainly feels like Grenco made little to no noticeable improvements to the device’s inner workings.

Not only that, but the company continues to use questionable/cheap materials despite health and safety concerns raised by us and other reviewers. This is a little disappointing because we look to leaders like Grenco to set the standard by making a commitment to enhancing the overall safety and functionality of vaporizers.

For example, the mouthpiece of the G Pen Pro is still made of plastic (PBT) with a melting point 240ºC [464ºF], rather than glass (preferred). Because of this, the vapor quality suffers, especially after long medicating sessions with continued use / increased internal temperatures. I know what you may be thinking…”but wouldn’t glass be more prone to breakage?” Yes, but glass is also cheap and easy to replace, inert, fairly heat-resistant, and typically improves overall vapor quality. To minimize breakage and allow for easy carrying, perhaps Grenco could implement some sort of push mechanism to either hide or extend the glass mouthpiece, similar to how a ballpoint pen works.

Perhaps we’ll see some exciting changes in the next generation, but only time will tell.

The material of the heating chamber is stainless steel. The white material around the heater is silicon, which has a melting point of 250ºC [482ºF] after a period of 30+ minutes of continuous heating.

Additionally, the small metal filter inside of the mouthpiece cover has tiny airways which tend to clog after just 2-3 sessions. Your purchase of the G Pen Pro does include a cleaning kit, with a brush that makes it relatively easy to keep clean with regular upkeep.

The G Pen Pro is a less than ideal option for getting the most flavor out of each draw – even when using top shelf herbs with strong terpene profiles. There is a burnt popcorn flavor that lingers after each draw, especially at higher temperatures, which only gets worse without the continued re-stirring of the ground material inside the heating chamber. This makes one wonder if it is due to poor design of internal mechanisms, the materials used (mentioned above), and/or because the unit uses conduction heating, which means that the ground material in the chamber risks becoming over-heated as it sits directly on the heat source.

The cleaning kit does include a stir tool to help mitigate the risk of overheating your herbs, but having to turn off the vape and stir up the material in the device’s heat chamber after each 2-minute session (especially when on the go) was a little annoying and is simply too tedious for heavy-use vaporists like myself.

What’s Included with the G Pen Pro Vaporizer

Open the G Pen Pro packaging and you will find:

  • 1 G Pen Pro vaporizer
  • 1 USB/Mini-USB charging cord
  • 1 cleaning brush
  • 1 G Pro tool

How to Use The G Pen Pro Vaporizer

To fill the G Pen Pro vaporizer, remove the plastic mouthpiece by popping it off with your fingers to reveal a small chamber. Grind your dried herb material (not too fine, but not too chunky), and pour it in to the herb chamber. Lightly tap down the material, but be careful not to over pack or it will restrict the device’s airflow and leave you dissatisfied with your session.

Something that may mix up new users is that the mouth piece is actually two separate but connecting pieces: a small rubber cap and a hard-plastic piece. Both should stay snapped together while removing the mouthpiece, if you take them off separately and put them back on separately, the rubber cap will not fit correctly.

To turn on the G Pen Pro vaporizer, simply tap the power button with a leaf on it five (5) times. When done correctly, the device’s LEDs will light up to the last-selected temperature setting.

The G Pen Pro has three preset temperature settings to choose from:

  • Blue: 375 F | 190 C
  • Green: 400 F | 204 C
  • Red: 428 F | 220 C

To select your desired temperature setting, press and hold the leaf button for five (5) seconds until you see the LEDs change colors to the next temperature setting. Continue to toggle through the different heat settings until you’ve selected your desired temperature. From here, the LEDs should be glowing, which signifies that the G Pen Pro herb chamber is heating up to the selected temperature. The LEDs will turn solid and quit blinking once the unit is pre-heated and ready for you to begin taking draws from the mouthpiece.

From my experience, the green temperature setting (400 F | 204 C) consistently generated the best results / most vapor. It takes roughly 15 – 30 seconds for the pen to reach the selected temperature setting (depending on the heat setting) which is certainly an improvement over the 60 – 90 seconds heat up time from its predecessor). However, you should know that it typically takes at least two to three draws (long inhales) until the herb in the chamber gets hot enough to produce vapor that you can see when exhaling. If you think the unit is not working, keep going and see how you feel after the unit heats up more and you take a few more draws.

Charging the G Pen Pro Vaporizer

The Grenco website states that it takes between 2 and 3 hours to fully charge the 2200mAh / 7.77Wh, 3.7-4.0V lithium-ion battery. We found this to be accurate, with a time closer to 2 hours when charging from a wall outlet. The four LED lights on the vape display the remaining battery life. When all LEDs are lit, the pen is fully charged. When there are less than two LEDs lit, the G Pen Pro should be charged.

The USB/mini USB cord can connect into a computer port or an adapter for a wall outlet. While the device is charging you get to enjoy a 4th color setting: turquoise!

For its price point, the battery life for the G Pen Pro is pretty good. We averaged about 8 long sessions (2 minutes per session), with 10+ draws per session. When doing this, the batteries would last roughly a day and a half on a single charge.

After trying a few different set-ups, we found that lightly packing to the top of the stainless-steel chamber with larger crumbs, combined with long slow inhales, gave the best results for vape flavor. We let the temperature sit at the green color and would get 6 or 7 nice long drags until jumping to the red setting after that for 3 or 4 more hits. The flavor quality dropped with more hits and had a strong popcorn flavor in the red setting.

The G Pen Pro Vaporizer: Final Thoughts

Although the G Pen Pro does what it sets out to do, it’s really nothing to get that excited about. The vaporizer essentially holds the same set of pros and cons as we outlined for its predecessor, the G Pro Herbal vaporizer. On one hand, the unit’s extended battery life, discrete design, and cheap price tag of $99.95 are strong selling points for someone looking to vape on the go. On the other hand, the G Pen Pro’s fast-clogging mouthpiece, inferior construction materials, and lackluster draws of vapor leave much more to be desired, especially for daily users.

Grenco Science, the company behind the original G Pen vaporizer, has quickly established itself as one of the largest and most well-recognized portable vaporizer manufacturers in the world. With celebrity …

MicroG Pen: Where to Get It, How to Use It & What to Expect

Nugg Team | March 22, 2016 | 1 Comment

This post takes you behind-the-scenes for an in-depth Grenco Science MicroG Pen review. Learn everything you need to know about this vape pen so you can determine if it’s the right vape for you.

What you’ll learn in this post:

[Click any of the section titles below to jump there]

Behind the Brand: Grenco Science

Until the advent of cannabis concentrates, choosing a marijuana vaporizer was tricky. Lower-end vaporizers were generally prone to breaking, and high-end vaporizers, while effective, were often bulky and expensive, and were often confined to a room with a spare outlet.

Once concentrates caught on with cannabis enthusiasts, demand for an easy way to smoke this potent but demanding form of marijuana was quickly met with the popularization of the vaporizer pen (or more commonly, “vape pen”).

Inspired by the sleek design of e-cigarettes, vape pens are meant to be equally discreet and effective. While vape pens have reached such a level of popularity that some have been optimized for vaporizing ground herb, they are traditionally designed exclusively for use with concentrates, most popular amongst which are oil, wax and shatter . These concentrates are often found in liquid-THC form, and packed in small cartridges, some of which are interchangeable among the different vaporizer brands.

SEE ALSO: our post on the best and worst vape cartridges currently available on the market.

And trust us, there are many brands, most of which have become successful at creating minimal and effective vape pen products. However, no company has become synonymous with the vape pen trend as much as Grenco Science. Though that name may not ring a bell to some smokers, anyone with a current knowledge of marijuana is familiar with their flagship product, the G Pen.

The G Pen has become a success due to a winning combination of great looks, brand ubiquity, and affordability (not to mention it was one of the first vape pens available). Though it has its fair share of rivals, it has more or less set a standard against which other vape pens are compared.

Since reaching this level of success, Grenco Science has released a few counterparts to the classic G Pen. One of these is the microG Pen, designed as a smaller alternative to their classic design. Those looking for a small and discreet vape pen should consider the Micro G Pen, though a number of caveats should be considered first.

The MicroG Pen: a Rundown

E ven for those unfamiliar with how the G Pen, or vape pens in general tend to work, use of the microG Pen is pretty straightforward. Of course, you have to have your own concentrates first, so if you aren’t fully-stocked, head over to Nugg’s website and order delivery from a cannabis dispensary near you that carries concentrates.

How to Load the MicroG Pen with Oil, Wax

To load the microG Pen with either oil or wax, use either the branded metal tool contained in the microG Pen kit, or your own tool with a curved metal tip, to grab a small amount of your concentrate.

Then, use the tool to place your concentrate into the metal chamber, located underneath the removable mouthpiece (which screws off). Make sure your tool is making contact with the lower portion of the chamber (on and around the coil), as that’s the part that tends to get hottest. Just be careful not to be too forceful with the coil itself, as it’s pretty delicate and can be dislodged with too much pressure.

How to Use the MicroG Pen

The microG Pen can be turned on or off by pressing the button located at its center five times. To activate the heating element located beneath the metal chamber, hold down the button for up to 15 seconds. At 15 seconds, the button will blink, deactivating the heating element, requiring a pause before it can be reheat, which prevents overheating.

By holding down the button, you activate the pen to work by drawing air through the holes located on the pen’s silver band, past the coils, and over your oil on the screen. When the oil heats up, it melts down through the screen and onto the heating coils, vaporizing it.

Hint: hold down the button for 5 to 10 seconds before taking your first inhale. It will allow your oil time to heat up, which packs a larger hit since the oil melts down onto the coil instead of sitting on the screen above it. By this token, the third and fourth hits are often best.

How to Charge the MicroG Pen

Charging is as easy as inserting the included charging cable into the microG Pen itself, and then plugging it via USB into a computer, or into a wall outlet via an included adapter. Once the red light on your microG turns off, it’s charged and ready for use.

Also included in the kit, which retails online for $69.95, are three additional metal chambers (also referred to as “tanks), five sleeves that fit over the mouthpiece to keep the pen protected while transporting it, two round glass containers, and three cotton swabs pre-loaded with isopropyl alcohol for cleaning.

The Good & the Bad

The biggest selling point of the microG Pen is its portability. Not only is it small and easy to carry in a pocket, but Grenco Science recognizes the importance of portability to buyers, and includes protective mouthpiece covers specifically to protect the pen while in your purse, pocket, backpack, or whatever other dark-space it’s hiding in.

Additionally, one of the biggest selling points of Grenco Science’s line of products, including the microG Pen, is an unrivaled aesthetic design. Though this may not be a concern at all to some, for anyone who would like their vape pen to be both portable and cool-looking, the microG Pen is a strong choice. Foregoing the metal sheen most often seen on vape pen products, the microG Pen is given a softer and easier to grip matte black finish.

Some users, however, have reported a build-up of old wax that’s very hard to clean from the metal chamber. Parts of this get vaporized with each successive use, however they only contribute to making the smoke harsher. You’re essentially smoking oil-reclaim at this point, which sounds nicer than it is.

Additionally, some users have reported that the pen has a tendency to disassemble itself when carried in a pocket. Considering that portability is one of the biggest advantages to its smaller size, this may be a detriment to those without other means to transport it.

Grenco Science offers a customer service line for product owners experiencing issues with their pen, however some users have reported a failure by Grenco Science to follow through on shipping the new parts they promised. Some have reported needing to get in touch with Grenco’s customer support up to 12 times before their issue was finally addressed, which is unacceptable in today’s age of customer-comes-first mentality.

Its battery life is also less than ideal. For most habitual users, the battery will last between one and three days. It then takes about an hour and a half to charge. While charging is as easy as plugging it into a computer or wall outlet, this may not be feasible in a public place where discreteness is also a factor, so be wary of short battery life if you’re someone who travels often, since it could get in the way of an otherwise good experience.

Hint: reduce battery-life pains by keeping your two batteries on alternating charge schedules.

Customer Testimonials

“For the stealthy and ease of use it is nice, but I will be honest, if you pack it up big a couple times it gets clogged, but in general nice vape pen.” —Beth K.

“The coil in it breaks after a couple weeks and needs to be replaced.” The site admin replied: “I have not had this issue before. I have owned my Micro G Pen for over 6 months now. My coil has lasted. I think it’s all how you clean your vape pen. I just use alcohol and let it sit for 5 mins and it’s as good as new.” Dave

“Great Pen, very sleek and satisfying. Small and it packs just what’s needed, easy to use! What more can any of us ask for. Sincerely, a very satisfied Micro G Pen customer… I am giving it 8-9 out of 10.” Anonymous

What to Know Before Buying a MicroG Pen

  1. Beware of counterfeit merchandise! Due to its recognizable brand, and scarcer information available on medical marijuana-related products, some scammers sell knock-off Grenco Science products for prices that are too good to be true. If you’re buying from a website, make sure you know it’s reputable.
  2. The coil in the microG Pen will last, on average, six to eight weeks. Replacements will cost $15
  3. The microG Pen is NOT intended for use with thicker concentrates. Though it may work, the lifespan of the coil may be impacted if used to vaporize thicker waxes.
  4. If the light on the pen flashes three times, there’s a problem in communication between the battery and the coil. This may indicate a problem with one of these two components.

Should I Buy the MicroG Pen?

Those looking for a pen that’s easy to transport that looks great should consider the microG Pen. While users have had mixed results with Grenco Science’s customer service and functionality itself, parts are under warranty, and can be replaced.

However, small and well-reviewed vape pens that may be easier to use at both higher and lower price points are also on the market, so prospective buyers should do some research first to find the vape pen that’s right for them.

Where to Buy the MicroG Pen

While we love sharing awesome content on our blog to help cannabis patients better understand the plant they love, and the products that help them enjoy it (like the microG vaporizer pen) we’re also pioneering the way for easy, quick, and professional cannabis delivery.

Nugg lets you find and order delivery online from local cannabis dispensaries in more than 60 California cities, including San Francisco, Los Angeles, and San Diego. Think of it like GrubHub for cannabis. It’s free to use, every order is backed by 24/7 Customer Service, and you can choose from thousands of marijuana products across hundreds of dispensary menus.

Just click the button below to visit our site, and use the search bar at the top to find “Vape” products near you!

About Nugg Team

1 Comment
Roy Mason

I first purchased a G pen Pro upon the advice of some friends, sounded great, get results w/o smell or bad taste, who doesn’t want that? Well I tried it many times (wasted a lot of very expense tobacco) to find it proved useless, no matter what I did I never felt like I was getting any results, because I wasn’t. I figured I got a bad unit, I then purchased the G pen Elite with it you can vary the temp and have more control over the process. After wasting that much more herb, I determined, at least for my wife and I that even though this is a great idea it actually doesn’t work at all . I even went so far as to remove the so called spent herb and put it in a pipe and guess what the pipe actually worked something I already knew but just wanted to see if it was just in my mind. All I can say if you are having good results bravo I’m glad some of you are getting results, my question is are your results just the placebo effect in action. Totally worthless product that is for those that have so much herb they don’t mind wasting it in order to look cool. I don’t care how I look I just want the pain to go away.

This in-depth Grenco Science MicroG Pen review offer instructions how to use it, how to load it, how to charge it, where to buy it, and more. ]]>