Its very difficult for a single torque wrench to meet all the torque requirements. So safe side is to buy a wrench in the torque range in which you work mostly. Otherwise you would need more than one torque wrench to cover all the torque applications.
When I was working on suspension components, changing the leaking shockers of my Ritz and swift, in my home, I found out that I need to go for a bigger wrench. The torque range was not enough. Good ones are pretty costly. Moreover you have to see that services are there in your area, because it needs calibration check from time to time. So you can not just go for a fancy name tag, because where will you send it back for calibration when you need to get it done.
As a tool torque wrench is not delicate at all. In fact it's a very strong and sturdy tool. Much stronger than common wrenches and spanners. Actually it's the calibration part which is delicate and prone to go wrong if used roughly. You cannot keep throwing them around like any spanner on the floor. The calibration will go for a toss. And the worst part is you wont even come to know of it until you get it checked. You will keep on over tightening or more risky under tightening the bolts,until you get it recalibrated.