The device works quite well, and is well priced. The guage on the front goes to much higher pressures than you need for brake bleeding, so the needle does not move far, and you can only get a very rough idea of the pressure. There is also a danger that people will not read the scale, or know the correct pressure to use, and think "I'll go half way", which would likely explode their brake fluid reservoir. There was also a fragment of plastic inside mine from the moulding process, so check before you use it.