2 it has both an optical heart sensor for measuring your heart rate and heart rhythm and an electrical heart sensor that enables the ecg app.
													
																	Apple watch series 3 38mm vs series 4 40mm. 
									
	
		
	
																	The apple watch se offers the choice of larger 44mm or 40mm compared to the 40mm or 38mm cases available for the series 3 both offer a retina display but the se is 30 larger 368 by 448 pixels. 
																	Apple watch series. 
																	40mm vs 44mm vs 42mm vs 38mm 1 1 will the apple watch series 3 straps works on the apple watch series 4. 
																	With apple watch series 4 the overall size of both variants previously offered has been increased. 
															
													
									
	
		
	
																	1 5 whom does each version suits the better. 
																	Apple watch series 3. 
																	Looking for apple watch series 4 vs series 3 and 44 42mm vs 40 38mm size comparison. 
																	Here s how the series 4 looks like in side by side comparison with the series 3. 
															
													
									
	
		
	
																	3 the digital crown provides haptic feedback when you turn it. 
																	1 2 what is the height and width of the apple watch series 4. 
																	Pulling up a map of manhattan on the 38mm series 3 and the 40mm series 4 i was blown away by how much larger and more detailed my location appeared on the bigger screen. 
																	The newer apple watch series 4 series 6 models come in 40mm and the 44mm though you can still buy the older models series 3 or lower with the. 
															
													
									
	
		
	
																	The size differences of the apple watch se apple watch series 4 apple watch series 5 and apple watch series 6 models might not sound like very much 3 4mm here or there but 4mm out of 40mm is one tenth of the apple watch s dimensions. 
																	38mm v 42mm 40mm v 44mm. 
																	Pack 3 compatible with apple watch band 38mm 40mm 42mm 44mm soft silicone band replacement for apple iwatch series 4 series 3 series 2 series 1 4 7 out of 5 stars 857 9 99 9. 
																	The back crystal of apple watch series 6 features four clusters of green red and infrared leds and four photodiodes used to measure blood oxygen levels with the blood oxygen app. 
															
													
									
	
		
	
																	1 apple watch series 4. 
																	The rounded rectangular shape of the apple watch makes it hard to compare directly with your average round watch but in the traditional watch world.