Samsung Galaxy Tab Pro 8.4 has a pixel density of:
359.39

A.K.A.
Released: 2014

Resolution: 2560×1600 8.4″ display

Wide QXGA (WQXGA) 2560×1600, 8:5 aspect ratio

Totaling 4.10mp (megapixels) and having a PPI of 359.39

Category: Tablet
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Samsung Galaxy Tab Pro 8.4

Samsung Galaxy Tab Pro 8.4 in White
Also known as	SM-T320 (WiFi) SM-T321 (3G & WiFi) SM-T325 (3G, 4G/LTE & WiFi)
Manufacturer	Samsung Electronics
Product family	Galaxy Tab
Type	Tablet, media player, PC
Release date	January 2014
Operating system	Android 4.4 Kitkat
System-on-chip used	Qualcomm Snapdragon 800 or Exynos octa-core
CPU	2.3 GHz quad-core Krait 400 SoC processor [1]
Memory	2 GB
Storage	16/32 GB flash memory, microSDXC slot (up to 128 GB)
Display	2560×1600 px (359 ppi), 8.4 in (21 cm) diagonal, Super Clear LCD display
Graphics	Adreno 330
Input	Multi-touch screen, digital compass, gyroscope, proximity and ambient light sensors, accelerometer
Camera	8.0MP AF rear facing with LED flash, 2 MP front facing
Connectivity	Cat3 100Mbps DL, 50 Mbps UP Hexa-Band 800/850/900/1800/2100/2600 (4G & LTE model) HSPA+ 42/5.76 Mbit/s 850/900/1900/2100 (4G & LTE model) HSPA+ 21/5.76 Mbit/s Quad 850/900/1900/2100 MHz (3G & WiFi model) EDGE/GPRS Quad 850/900/1800/1900 (3G & WiFi model) Wi-Fi 802.11a/b/g/n/ac (2.4 & 5GHz), Bluetooth 4.0, HDMI (external cable)
Power	4,800 mAh Li-Ion battery
Dimensions	219 mm (8.6 in) H 128.5 mm (5.06 in) W 7.2 mm (0.28 in) D
Mass	WiFi: 334 g (0.736 lb) 3G: 336 g (0.741 lb) 4G/LTE: 338 g (0.745 lb)
Related articles	Samsung Galaxy Tab Pro 10.1 Samsung Galaxy Tab Pro 12.2 Samsung Galaxy Note Pro 12.2 Samsung Galaxy Tab S 8.4
Website	http://www.samsung.com/global/microsite/galaxypro/

This righthand infobox courtesy of Wikipedia.