Extech DO600 Waterproof ExStik II Dissolved Oxygen Meter - Portable DO Tester with Salinity and Temperature Compensation, Auto Calibration, Data Hold, Min/Max, Large LCD

It is nice to not have to deal with a meter box to lug around. I use this for measuring water quality of fish tank/aquaponics parameters. This handheld gives the temperature rapidly. The dissolved oxygen reading takes about 20 to 30 seconds to stabilize. The calibration and adjustability makes this a very convenient tool to have in one's pocket or hanging from the neck.

The second time we attempted to use the Extech "waterproof" DO Meter we found it totally dead. When we removed the cap, the entire inside of the meter was wet with water an battery acids. Either outside water had entered the meter from somewhere or the fluid around the probe found its way inside the meter. Either way this was not only a useless purchase but it's failure has possible compromised a study. Extech will not be on anybody's shopping list around here any time soon!

It works very good for first time, will see how much it last ;-) Very easy to use.

Using it to monitor aquarium O2 levels day and night at different depths to ensure stocking density doesn't cause depletion levels. Very accurate based on calibration.Had an issue understanding the calibration process at first and technical support was easy to access and walked me through the process. I appreciate that. Might buy other products from them.

DO meter came in late and wouldn't turn on past the self startup. Basically sat stuck there forever and looks like some others had the same issue. I have issued a return and will try another to see if it was just a bad device and update my review accordingly. The instructions are really bad and honestly seems overly complicated to get it setup.

Purchased in October 2016. Easy to use. In addition to disolved oxygen displays temp. However very slow working. In January 2017 stopped working all together. It goes through self calibration then displays 00.00 for both DO and T. When was operational it was OK.

No estoy satisfecho con el instrumento. En colombia no se consiguen los repuestos y si los hay, cobran demasiado. Después de año y medio me di cuenta que el electrodo estaba roto internamente, por eso nunca pude usarlo. No hay soporte para este país.

It works well and gives you peace of mind. More expensive units would be more precise and consistent.