I need the device to check the blade itself sharpened knives. It meets my expectations 100%. I would not recommend that you set for this purpose a device with lower magnification than 100x. 100x is ideal. However, one should not think that the device is a substitute for a microscope, as mentioned in another review. For this purpose, the magnification of 100x is too low. And with the increase in fixed preset you would also be entirely restricted to a specific optical "viewing plane". In summary, I can say that the device is the low price more than worth it, but you should know exactly for what purpose you want the device.