A stop watch you can interpret QUICKLY & ACCURATELY and then not confuse when you reset!
If you want a clock work watch buyt the expensive one they are all the samre for seconds but reading the minutes cannot also be important. Simple electronic watches are accurate but have to many functions and you you doin't want to be starting the the NDB hold discovering you are trying to set the time.
Salters make some quite good kitchin timers that do all you need for IR.
But then if you are doing IR/IMC you already have a timer in the ac so why not use it. Might not be in direct line of sight but the battery doesn't go flat