R/C Plane At 4,000 Feet!!!!

Trying to figure out how high I can fly my AXN Floater Jet from Hobby King. :) This is the highest I have flown by far. I meant to glide at the top, but I was too focused on watching the plane to remember! Altimeter is an Eagle Tree V4 unit. Video camera is a #16 keychain camera with software. Because the altimeter only has one digit, it has to flash to display a measurement.  Like if it went to 2,345 feet, it would flash, 3 flash, 4 flash, 5. :) I wonder if I can see it