I got this product from a nearby supermarket store and finally I found it online too. It is a problem solver in many ways , as I m living in a city and trust on milk vendors is a concerning thing. I brought it home for testing and too my surprise it really works. I could check my milk quality within seconds and also it helped me built trust on my milk vendor and ya to scare him too ( sometimes
) 😂. I recommend this product highly as it is quite accurate and easy to use.