You need to understand that this is a clone of the famous original device, which costs a little different money (from 3). This device has a different chip, a different circuit, a different battery. You also need to remember that the readings given by this device are very conditional and for accurate measurements you need to assemble a real circuit and measure the parameters there. For preliminary selection of details will go. also interesting for beginners to play around. If there is interest, it is quite possible to buy. The price is not much more expensive than in a well-known foreign store.
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