MNFISH2,
YSI are great products geared to more of the scientific community. Used a couple different models on projects and they worked great. There are other brands of meters that are just targeting for DO-Extech, Milwaukee (MW600), Hanna Oxygen meter, just to name a few.
If your just using on your pond or lake, a small hand held unit will be fine IMO. Now if I was doing more I may look into some of the more $$$ models.
It comes down to your budget and goals.
Have fun and enjoy the ice fishing.
Last edited by Joshua Flowers; 01/03/17 10:56 PM.