Snap-on recommends storage of click type wrenches at the lowest setting. I always store my torque wrenches in their case and set at the low setting of the scale or one more turn past. I am an A&P/IA and when I was working as such my wrenches were calibrated if I recall every three months. The facility I worked in also had a tool for a quick check before each use especially if a critical torque. Yes, you can argue the cause, but I know as certainty that habitually leaving a click type torque wrench set at a working value will result in a tool that is not accurate and will need adjustment/repair. Do not use your torque wrench to run on a fastener, remove fasteners or general ratchet duty and avoid dropping them, hitting them with hammers or other squid moves as they will be damaged.