This is a great feeler gauge at a great price. There's no need to spend lots of money on this bit of kit. However, just remember to give them a quick coat of oil/grease/wd40 when you've finished with them.
The gauges range from 0.05 ~ 0.80 mm, which means that, when you combine various gauges, you can get any depth possible up to a maximum of 3.8 mm.
All the gauges are clearly marked & easy to use.