I've tried this product on several touchscreen devices (iPad, smartphones, laptops) and it doesn't draw solid lines on any of them. I have returned the item. I then received the email below. "We wholeheartedly appreciate your opinion and we are very sorry that the products did not meet your requirements and caused you any inconvenience. However, please understand that negative feedback is indeed very harmful to small businesses. How we are. Because it affects not only the product to which it corresponds, but also other products sold in the store. And I also hope you understand that we want to sell products that everyone can afford, not custom products that only belong to the rich. Therefore, it is inevitable that people have different attitudes about it. Of course, we do not say that yours Rating is wrong, but actually it can negatively influence people's judgement, which will be fatal for our sales. If you don't mind deleting your review, we'd be happy to refund you $30 in return for your understanding and apology. Of course you do not have to send the item back. Look for testimonials from our valued customers like you. Your help will be very important to us. Please give us a chance to do better next time. After you have deleted a review, please provide us with your PayPal email address. We will refund your PayPal account within 2-3 business days after it is deleted. If you prefer an Amazon gift card, we can buy one for you and send you a secret code. You can transfer it to your Amazon account and use it freely to buy any Amazon products. Thank you for taking your precious time to read this. Please don't hesitate to ask if you have any questions about this. Greetings and looking forward to your reply. "
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