[J57ltr]

Those are the same brand sold by HF, they work ok when they work, but most of the time they turn them selves on and run the battery out. I have a set of 6" and a set of 4" and nothing but problems with the 4" Any time they move they turn on and any time I close the case they turn on. So the batteries are always dead unless I remove it. They are as accurate as my Mitutyo dial calipers, but not near as reliable. I have been through 3 sets of the 4" and I decided to junk them and just stick with the dial calipers. They are easy to read (unless some tries to clean the dial with solvent), and in no time you can read a dial as fast as a digital set.

Personally if you use them all the time, spend the money and get a good set. If you just use them once in a blue moon then they should be fine for you, just remember to remove the battery. Also you might want someone to make you a little block so you can check them and make sure they are still linear. I use a block that I machined to 1" X 2" X 3" to .0005"

Jeff