Review on Accurate Plastic Caliper Metric Measuring Tool 📏 for Student Tests: Reliable Test, Measure & Inspect Device by Will Murphy

Because the lines on the vernier don't reach the border between the two pieces, it's impossible to tell which of the lines exactly match. These calipers are probably accurate to around 0.5mm (while with a serviceable vernier they will give answers to 0.05mm as long as the markings are evenly spaced). Handy for offensive environments, but I wouldn't buy them again.