I confess I was a little scared at first before buying one of these but it's very easy to use and saved my sea monkeys/water dragons! I had fun doing my own experiments on the difference in salinity between sea monkeys and aquatic dragons at different stages of their lives. Just remember to calibrate your device before using it. All instructions are included and calibration is very easy! Seeing in the viewport is a little tricky at times, but I found that using my phone's backlight helped me read the numbers! The results are very fast, in just 10 seconds! If you have any doubts about getting one of these, my advice is to just buy it. I love my!
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