I recently purchased the ESynic 4 Inch/100Mm Digital Caliper and have mixed feelings about its performance. On the one hand, its stainless steel body and electronic display give off a professional and high-quality vibe. The caliper also accurately measures length, width, depth, and inner/outer diameter in both inches and metric units, which is great for those who work with different types of measurements. However, I found that it was frustratingly difficult to get the caliper to stay in place when measuring something. It was often loose and slid around, leaving me with inaccurate measurements. Additionally, the on/off button felt a bit cheap and became temperamental over time. Overall, I would give the ESynic Digital Caliper 3 stars out of 5. It has its benefits, but the frustration caused by its instability and button issues make it hard to rely on for precise measurements.