By accessing our website, you, the user, agree to use the terms and conditions set out here. These terms and conditions may change at our discretion at any time and without prior notice. All orders and purchases made through this site are governed by these terms and conditions. The purchase of merchandise through the GrencoScience.com website is strictly limited to parties who can lawfully enter into and form contracts on the site in accordance with the laws of the jurisdiction of their residence. By entering the GPen.com website you agree that you will access the content solely for your personal, non-commercial use. All illustrations, designs, icons, graphics, photographs, pictures and any other items included in this website are the exclusive property of Grenco Science, Inc. unless otherwise stated. These Terms & Conditions apply to the purchase of goods from GPen.com only.


In these Terms and Conditions:

  1. “Seller”, “us” and “we” are references to the owner of this website, Grenco Science, Inc., which is a registered corporation in the USA.
  2. “Buyer”, “you” and “your” are references to the purchaser of the goods from us;
  3. “Goods” means the goods specified in the Seller’s invoice;
  4. “Contract” means the contract between Seller and Buyer for the sale and purchase of the Goods which incorporates these Terms & Conditions;
  5. “Terms” means these terms and conditions;
  6. “Site” means the GrencoScience.com website.


  1. In order to make purchases through the site, the buyer will be requested to register and provide personal details. In particular, buyers must provide their real name, phone number, e-mail address and other requested information as indicated.
  2. When ordering items, the buyer will be required to provide payment details and you represent and warrant that the payment details you provide on ordering are both valid and correct and you confirm that you are the person referred to in the billing information provided.
  3. When an order is made online, the order confirmation issued by the company clearing the credit/debit card payment does not constitute acceptance of your order by us. We reserve the right to check any discrepancies and an order will only be processed when it is verified by us to be accurate and within the guidelines set forth in these terms.
  4. All orders are subject to acceptance and availability.
  5. Any error in the ordering process due to technical or other reasons beyond the seller’s control entitles us not to treat the order as being binding on us.
  6. Purchases made on the site are for the personal or gift use of the buyer only and are not to be used for resale. The site displays products, which form its collection. They are normally products that are in stock and available for dispatch, however on occasion certain products that are in particularly high demand will sell out quickly. Should this be the case, you can contact our customer care department at help@grencoscience.com who will be happy to add your details to the waiting list and contact you should the item again become available to arrange payment.


  1. Once a choice has been made and the order has been placed, the buyer will receive an email acknowledging the details of the order. This email is NOT an acceptance of the order. Unless the buyer cancels the order in accordance with the seller’s Cancellation Policy, acceptance of the order and completion of the contract between buyer and seller will be perfected when we dispatch the goods to you.
  2. The sale contract is therefore concluded in the USA and the language of the contract is English. The contract will be subject to these terms and conditions and governed by US law and the buyer agrees to submit to the non-exclusive jurisdiction of the United States Courts in respect to any dispute that may arise under it.

The seller reserves the right not to accept the buyer’s order in the event, for example, that we are unable to obtain authorization for payment or that the item ordered is out of stock.

Your use of any Grenco Science product is subject to all agreements including the Terms of Use and Conditions.

Grenco Science products are for sale strictly to individuals 21 years of age and over. Misrepresentation of a buyer's age is not the responsibility of the seller.

All Grenco Science products are intended for use with essential oils, and contain heating elements and sensitive mechanics.  The products are not intended for illegal purposes, included but not limited to the consumption of narcotics, THC, or THC derivatives (collectively "foreign combustibles").  The use of foreign combustibles or other unintended materials may result in damage to the contents of the product or degradation of the materials and mechanics within the product.  Any warranty, express or implied, shall be voided by improper use.  By opening the packaging, you confirm your acceptance of the Terms of Use.  


  1. Prices shown on the site are in U.S. Dollars (USD). All prices and offers remain valid and as advertised from time to time. The price of a product displayed on the site at the time the order is accepted will be honored.
  2. If the buyer is from outside of the United States, the buyer may also incur duties levied by the jurisdiction to which you have specified delivery. International shipments may be subject to import duties and taxes upon arrival in the destination country. These duties and taxes are the responsibility of the customer. Furthermore, a buyer from outside the U.S. may also be subject to higher postage and packaging costs. The seller reserves the right to request additional shipping fees prior to the Goods being dispatched, and to not accept the order should the buyer not fulfill the seller’s requests to pay additional postage and packaging fees.


  1. Payment for Goods and for the cost of packaging and delivery where applicable must be made before the Goods are dispatched.
  2. Payment can be made by Visa, Master Card, Discover, or American Express. In all cases, delivery will not occur until we are satisfied that the payment has cleared.
  3. If the issuer of the buyer’s payment card refuses to authorize payment to the seller, we will not be liable for any delay or non-delivery.
  4. All credit card transactions on this site are processed using a secure online payment platform that encrypts your card and/or banking details in a secure host environment. The seller does not hold any credit card details on our site or in our customer database.


  1. The seller will give the buyer an estimated delivery date for the goods, but no such estimated times or dates provided by us are guaranteed. USPS delivery times are never guaranteed. Orders may take up to 2 business days for processing and fulfillment from when the order is placed, and cutoff time for possible same day shipping is 12:30 PM CST.
  2. International orders can be subject to holds and clearance delays due to international customs. These delays can not be predicted or altered in any way. 
  3. The seller will arrange for packing according to the method of delivery chosen by the buyer during the checkout process.
  4. Should the buyer choose USPS as a method of shipping, responsibility for the purchased goods passes to the buyer at the time USPS takes possession of the good.
  5. Should the buyer choose UPS or FED EX as a method of shipping, the responsibility for the purchased goods passes to the buyer when the shipper records “DELIVERED” in their respective tracking information.
  6. FedEx and UPS do not provide delivery service to PO Boxes. If you are having an order shipped to a PO Box please select USPS, so that the package is not delayed and/or returned. 
  7. The buyer must check the goods immediately upon delivery and contact the seller if there are any problems with the goods. The buyer must notify the seller within 24 hours of delivery to ensure prompt attention as completed orders are filed away daily.
  8. In the case that the goods have been damaged in transit, the buyer must keep all packaging, as this may be required when making a claim.

The seller will not be liable for any loss, damages or penalty resulting from delay in delivery of the goods when such delay is due to causes beyond the reasonable control of the seller, including without limitation, supplier delay, force majeure, act of God, labor unrest, or fire. In any such event, the delivery date will be deemed extended for a period equal to the delay.


  1. The seller’s chief objective is to ensure the buyer is fully satisfied with their purchase. If, for any reason, the buyer is not satisfied with the goods purchased from our website, the buyer has a right to return the product (within 7 working days from the date that product is received) for an exchange or a store credit that could be used for future purchases. No refunds will be issued. The buyer need not give any reason. The notice of exchange or return has to be made in writing; an email will suffice: help@grencoscience.com. In the event of a return or exchange, we require that you return the goods to us at your own cost.  For sanitation purposes, all clothing and hats purchased (included but not limited to:  Men's/Women's T Shirts, Men's/Women's Tank Tops, Snapbacks, Beanies, Pullover Hoodies) are considered final sale.  No store credit / exchanges / returns will be accepted under any circumstances. Mystery Boxes or bundles are also considered final sale and cannot be returned.
  2. In order to qualify for exchange/store credit, the goods or packaging may not have been open, damaged, or used. Once the outer packaging has been removed from the product, it is considered final sale and cannot be returned.
  3. In order to help with your order issue, you must open a ticket with our Customer Service department by emailing help@grencoscience.com within the cancellation period.
  4. Our return address is detailed on your original invoice. Failure to obtain an RA does not affect your legal, consumer rights.
  5. The buyer must take reasonable care of all goods in their possession and return them to us, with their original packaging, within 7 business days from the date the RA number was issued.


1-Year Warranty


At Grenco Science, we stand behind our products and provide a 1-year warranty on electronic components against manufacturer defects. 


Program includes the G Pen Elite Vaporizer™, G Pen Pro Vaporizer™, G Pen Connect Vaporizer™, G Pen Dash Vaporizer™,G Pen Roam Vaporizer™, G Pen Micro+ Vaporizer™. This includes all special edition or Artist Series versions of these products.


2-Year Warranty

Program includes the G Pen Hyer Vaporizer™ and G Pen Elite II Vaporizer™


  • Warranty requires a valid proof of purchase, showing the date and location of purchase. If the purchase was made from gpen.com, your order number will be the proof of purchase. 
  • Register your device at https://www.gpen.com/apps/product-registration to validate your purchase upon receipt to initiate your warranty. 
  • For warranty support, email us at help@grencoscience.com or complete our contact form. You will receive a reply within 2-3 business days from one of our representatives, who will verify your device and request photo or video documentation of the defect. Once provided and verified, a replacement device will be sent to you.
  • If the item is a special edition or Artist Series that is no longer available, it will be replaced with a unit of equal value.
  • Legacy products that are no longer in production will be replaced with the most similar current product available, only with valid proof of purchase.
  • Warranty is not applicable to mouthpieces, tanks or coils - these are consumable parts that wear down with normal use and need to be replaced over time.
  • Warranty is not applicable to glass. 
  • Warranty does not cover cosmetic damage or any damage resulting from normal cleaning.
  • Warranty is not applicable to counterfeit items. Almost all “Grenco Science” products for sale on marketplace-style sites like eBay, Amazon, Bonanza, Alibaba and Rakuten are counterfeit products. We cannot offer warranty service on any items from such sites.
  • Warranty is not applicable to merchandise. All merchandise sales are final.





In order to shop on the seller’s site all users must be registered. The details provided are saved in our database in order to process the order and to facilitate and speed up future purchases. Please see our Privacy Policy for more details regarding how Grenco Science manages this information.


Users of this site may access, amend or delete any data filled in on the registration form at any time; either in writing, or via email at help@gpen.com.

The seller may from time to time contact you by email with information on new products; special discounts or other information we believe may be of interest to you. Any e-mail we send you will contain an easy unsubscribe link from all future mail shots.


The website is accessed and used at your own risk. Although reasonable efforts have been made to ensure that all details on the website are current and contains no inaccuracies or errors, no guarantees are made that the website’s content will be error free, accurate and current at all times.