So, you might ask me. What is this for? How do you use this? 

This is the developer console. I use this when I flip to keep track of time and items bought/sold. 
You can access the developer console by pressing the "alt" button and the "~" button. Press alt first then press "~".
There are 5 key words to use in the developer console. 
Buy
Sell
Bought
Sold
Time check

As we all know, we use the time to know if we can stretch the margin or lower it. The better time tracking we have, the more precise the margins are. 

Buy - Use this when you have ==Put up an offer (Not bought an offer you have already made earlier)==
Bought - Use this when you have bought the item you have put an offer to earlier.
Sell - Use this when you have ==Put up an offer (Not Sold an offer you have already made earlier)==
Sold - Use this when you have sold the item you have put an offer to earlier.
Time check - Use this to know if it has already been 30 minutes to use the 25k/30minutes rule.

There are also personal things you can put up like "Bg lower" (As shown in the picture). This means that on that time, I used the 25k rule on Bg.

So, how is this efficient?
The developer console is very efficient because it has time on the side and it does not erase. You can easily scroll up or scroll down the items you have listed earlier.

I have put up an example of my flips (These are real reports) and as you can see I can easily report the time it took for me to buy/sell the items. 

I used the ==Time check== to check if it has been 30 minutes to use the 25k/30minutes rule.

its oke if ur bankstanding, but if ur doing other stuff while flipping, its really annoying having it in your eyeside.
and sofar i know everything will be erased when you close and re-open it.
so then it wont work.
so i see its potential, but it will keep his flaws

I agree with what Dantastic says. I myself use a simple html page I made where you can check a box next to the item you bought, say at what time you bought it, and for a timer I simply use the stopwatch on my phone.

also just rememberd, if you want to have a thing with time,s why dont use this>>
https://flipchat1fc.forumotion.com/t898-hsperia-a-brand-new-tool-for-flippers
its a device made by 1 of our higher ranks.

Great thanks! 

Definitely something great to know while flipping to give accurate reports:)