>Decent build quality with smooth handle operation.
>Accurate between 40-60 in-lbs. (4.5 – 6.7 N-m) – Sweet spot for most bicycle nuts and bolts.
>Very distinctive “click” sound and feel even at lowest setting of 20 in-lbs.
>Only accurate between 40-60 in-lbs. Outside of that range you're looking at +/- 11% accuracy.
>Difficult to read markings on handle.
I bought this 1/4 Bulltools torque wrench mainly for bike repair and maintenance at home. Before using it I tested its accuracy with a calibrated digital torque meter (HIOS HP-100). Test range is limited to 90 in-lbs. since that is the max capability of the torque meter. I only tested for clockwise accuracy.
Percent Error are as follows based on average reading of five measurements at each settings:
20 in-lbs.: Average reading = 22.24 in-lbs. (Percent Error = 11.2%)
40 in-lbs.: Average reading = 40.36 in-lbs. (Percent Error = 0.9%) - Impressive!
60 in-lbs.: Average reading = 57.48 in-lbs. (Percent Error = 4.2%)
80 in-lbs.: Average reading = 70.86 in-lbs. (Percent Error = 11.4%)
90 in-lbs.: Average reading = 79.33 in-lbs. (Percent Error = 11.9%)
I retested at 90 in-lbs. using the weight method and a 13-pound dumbbell. With the drive secured on a bolt via a socket I tried suspending the dumbbell on the handle at different distances from the drive starting at 5” and going outward to see where it “clicks”. The wrench breaks/clicks consistently at 6” distance from center of the drive, which translate to 78 in-lbs.
The values on the calibration certificate shows clockwise percent error of less than 1% at three different settings. The percent error I got at five different settings do not seem to agree with the certificate, as my results vary between 0.9% and 11.9%. Unfortunately, this had to go back since I need a torque wrench accurate at a wider range than just 40-60 in-lbs. (4.51-6.77 Nm). Otherwise I would've just bought a preset 5 Nm torque driver.