I added a torque wrench to my tool box some 2 years ago but never really made use of it till this year, and when I did, I got in love with the clicks!
Now I always tighten bolts to their torque spec, no more guess work

Below is a pic of mine

Before we discuss benefits, a few pictures of...#coughs...not torquing to spec.

Saw the second pic and couldn't believe someone would be driving a car with only 2 lug-nuts

Stripping of bolts, threads and eventual breakage are all consequences of over-tightening nuts. This is one of the primary causes of broken wheel studs as shown in the previous pics. Some people just torque and torque lug nuts until they can torque no more . My car for example lists 79ft/lbs as the torque for lug nuts and since I started using a torque wrench I found out that I could still tighten the nut further after reaching 79ft/lbs. That's if I was just using a wheel spanner. Its even worse if you patronise a Macho kazeem vulcaniser you could end up with 500ft/lbs on the nut

all ears

Again, aluminum is a pretty soft metal, so its good to pay attention to listed torques when working on your engine. There are jobs I wouldn't recommend a DIYer attempts except he has a torque wrench e.g. valve adjustment.

I recently did a valve clearance check and replaced my leaky valve cover gasket. I was surprised to see how low some of the torque specs for the crankcase bolts were. Same goes to the different parts that bolt unto the block.

Spark plugs also have their recommended torques. Over or under torquing can cause the plugs to overheat with consequent combustion problems. Some people with experience though have learned to take on such tasks by feel. However, I still recommend using a torque wrench and a good one too.

Please what's the cost of the tool?

That looks like a 3/8 torque wrench.. where did you get this?

So how does it show the tightening is 'healthy?' Does it have a readable meter that shows the amount of force you are putting on a bolt, and where can one buy it from?

whatofyou:
So how does it show the tightening is 'healthy?' Does it have a readable meter that shows the amount of force you are putting on a bolt, and where can one buy it from?

It has a readable scale, which you set according to the recommended torque for any given nut, or bolt. Once you tighten to the preset torque value, you'll get a very audible click.

Mine are from Snap-On, and besides giving a "beep" once the value is reached, they are also digital.

Raymie:
Please what's the cost of the tool?

Depends on the type you are buying. If you have someone outside the country cost be around 10k. Here it should cost higher

bigrovar:
That looks like a 3/8 torque wrench.. where did you get this?

Sharp eyes. Its a 3/8, got it because it fits almost all the torque spec for my car. Got it from jand.

Bigrovar in addition, I had to buy a set of adaptors; 3/8 to 1/2 etc. It sold cheaply on Amazon. As you know most single sockets that I've seen here are 1/2

For those asking for how to get this, if you don't find it in the car parts market around you, you could send me a PM, I have a shipment coming in the next 2 weeks from jand and may be able to help.