Thinking of a new chronograph

Here's what the spread sheet looks like, sorta.

Name: pellet gun
Shots: 9
Average: 244 FPS
SD: 2 FPS
Min: 242 FPS
Max: 250 FPS
Spread: 8 FPS
Barometric Pressure: 30
Temperature: 41
Weight: 12 grains
Index Velocity Temperature Barometric Pressure Bullet Weight Ft/Lbs Power Factor Date
1 250 41 30 12 1 3 5/22/2015 15:20
2 245 41 30 12 1 2 5/22/2015 15:22
3 247 41 30 12 1 2 5/22/2015 15:22
4 245 41 30 12 1 2 5/22/2015 15:22
5 243 41 30 12 1 2 5/22/2015 15:22
6 242 41 30 12 1 2 5/22/2015 15:22
7 242 41 30 12 1 2 5/22/2015 15:22
8 245 41 30 12 1 2 5/22/2015 15:22
9 243 41 30 12 1 2 5/22/2015 15:22
 
Ok, same type of output on the PC software minus the temp and pressure... So, nice to just have to take a tablet versus a PC and long cord to go shooting!
 
Here is output from the USB/PC connection:

String: 1
Date: 5/23/15
Time: 9:35:52 AM
Grains: 180
Hi Vel: 1260
Low Vel: 1226
Ave Vel: 1237
Ext Spread: 34
Std Dev: 9
IMR 800X 9.0 gr - Hornady 180 gr HAP - Federal 150M - OAL 1.260
Velocity Power Factor Ft/Lbs
1228 221.04 602.658
1240 223.2 614.494
1260 226.8 634.476
1227 220.86 601.677
1238 222.84 612.513
1226 220.68 600.696
1238 222.84 612.513
1244 223.92 618.465
1235 222.3 609.548
1238 222.84 612.513
 
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