For the chrono, it's a "big" investment at first, but I bought mine and don't regret it.
Just get a good one, even if the price is higher. The ASC first choice would be the xCortech x3200, around 90$, and since you have the same as everyone else, your readings won't be off with the community.
K3vX | Airsoft Gunsmith/Gun doctor in training.
Feel free to contact me in your preferred language and I'll gladly answer.