Amazon Kindle Fire HD has a pixel density of:
215.63

A.K.A. Kindle Fire HD 7″
Released: 2012

Resolution: 1280×800 7″ display

Wide XGA (WXGA) 1280×800, 8:5 aspect ratio

Totaling 1.02mp (megapixels) and having a PPI of 215.63

Category: Tablet
Tags: kindle, amazon, android, amazon app store, fire, hd

Amazon Fire HD

Fire HD (2012) 8.9″
Developer	Amazon.com
Manufacturer	Quanta Computer
Type	Tablet computer
Operating system	Fire OS 7.5.1 (Based On Android 4.0.3) – 5.6.1.0 (Based On Android 5.1.1)
CPU	ARM core (see table)
Memory	Kindle Fire HD 7 (2012), Kindle Fire HD 8.9 (2012), Kindle Fire HD (2013), Fire HD 6 & 7 (2014), Fire HD 8 & 10 (2015) – 1 GB Ram Fire HD 8 (2016) & (2017) – 1.5 GB Ram Fire HD 10 (2017) – 2 GB Ram
Storage	8–64 GB Flash (internal)
Removable storage	MicroSDXC slot (Fire HD 8- 2015, 2016, 2017 & Fire HD 10 – 2015 & 2017
Display	6″, 7″, 8″, 8.9″ (mostly HDX models), 10.1″ LCD
Sound	Stereo speakers
Camera	Kindle Fire HD 7 (2012) & Kindle Fire HD 8.9 (2012) No Rear Camera, 1.3 MP HD 720p Front Camera Kindle Fire HD (2013) -No Rear Or Front Cameras Fire HD 6 & 7 (2014) – 2 MP Rear Camera, 0.3 MP Front Camera Fire HD 8 & 10 (2015) – 5 MP Rear Camera, 1.3 MP HD 720p Front Camera Fire HD 8 (2016) – 2 MP Rear Camera, 0.3 MP Front Camera Fire HD 8 (2017) & Fire HD 10 (2017) – 2 MP Rear Camera, 0.3 Front Camera
Connectivity	Micro-USB 2.0 (type B), Micro-HDMI, 3.5mm stereo jack, 802.11 Wi-Fi, 4G LTE (8.9″ model),[1] Bluetooth[2]
Online services	Amazon Prime, Amazon Cloud Storage, Amazon Cloud Player, Amazon video, Amazon Silk, Amazon Appstore, Amazon Kindle Store
Predecessor	Kindle Fire
Successor	Fire HDX
Website	Amazon Fire HD

This righthand infobox courtesy of Wikipedia.