28506 TorqueVario-S Torque Screwdriver, 10-50 Inch Pound

Item exactly as described. Excellent for tightening screwsand bolts used in an rv, such as in a converter, or for electronic equipment.

I purchased this torque driver mainly to mount a scope onto my rifle, I know alot of people do not go to such lengths but having crushed a cheap scope tube in the past I was not going to risk doing the same to a scope worth well over a thousand dollars. This tool was just the trick, there are cheaper alternatives on the market but I already own some other Wiha brand tools and they have always been superbly crafted and durable as you can get. This torque driver seems to be no different. Setting the desired torque is very easy, the readout goes from 10-50 in.lb. in 2lb increments, so lets say you want 17 lbs you just set it between the 16 and the 18. which is very easy to do. Setting the torque with the supplied "torque setter" that goes into the shaft of this driver and you turn it just like a screwdriver is much easier and quicker than you might expect. Also the break on this is very tactile and you do not really risk over torquing. The handle is substantial enough to get all the way through the torque range, however 50 in.lbs. is a bit difficult to do with a handle such as this, a T handle would be much easier for anything beyond that. As other reviewers have mentioned if you are going to use the standard 1/4" bits found in the U.S. you will need to buy the matching adapter "Wiha 28581" Comes in a little plastic case that you typically find large drillbits or taps inside of with two little halves that mate together with ribs to lock it in place. Nothing fancy but really what more do you need? The whole kit is not cheap but it certainly feels like a quality tool and a pleasure to use as most people will agree goes for any tool that is well made.

We use these at work for mrdical equiptment. Unit came in with a certificate of calibration

This product works extremely well, is consistant in its setting and typical of old world German quality workmanship. It is much better value for the money than some other torque screwdrivers and I like the fact that it comes with a certificate of testing and calibrating that uses 6 tests per setting in several ranges. Mine showed less deviancy from settings than 3% with 1.2% being the average. Many box store devices of this kind claim accuracy of +/-6% and no certificate of testing actually comes with them. The accuracy noted on certificate indicates that it is done on I.V. (indicated value), not FS (full scale) value. This is very important since many other drivers use FS accuracy which gives a false impression of accuracy. Understand this more here....[...] The positive clik disconnect limiting mechanism eliminates the posibility of over torquing a screw or bolt. An added bonus of this driver is that it works in reverse at an added 50% of the shown torque value. This is extremely helpful when backing off fasteners to retorque at slightly higher settings. It eliminates the need of adjusting the driver or using another driver to do this task. The unique beneffit of this driver is that the adjustment system is internal and done with the tool which accompanies it. This design keeps the internal fine threads of the adjustment mechanism protected if the driver happens to be dropped on the floor. Other drivers typically use an external adjustment like a rotating collar or cap and if this gets any impact, the driver can easily be damaged or at best, require immediate recalibration.

This is, of course, a nice high quality screw driver. It performs well and looks like it will hold up. Downsides: You need to buy a separate item to accommodate typical US style driver bits. Problem with using those though, is that the size of the bit holder can get in the way. I had to buy some extended square drive tips to be able to torque down the bolts on a tandem circuit breaker. Also, the odd arrangement of having to remove the bit holder and use a separate tool to set the torque is tedious. I can see the advantage - you prevent someone who is torquing the same screw all day long from changing the setting. But if I need to switch between several settings in the course of a few minutes it's not so great.