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Hi All, Am new to SKF and shrimp keeping, so not much to post regarding shrimp. However thought I'd post this review here that I recently put up on a different forum. Given how sensitive shrimp are to water parameters, it's probably more relevant for shrimp keepers than most fish set ups. Here's my review up of this water chemistry tester I purchased a few months ago. I've used Hanna Instruments handheld TDS and pH meters before but decided to spend my hard earned on this new item. Two things to note here: firstly, this gear isn't cheap. The HI 83203 photometer is roughly $875-$900; second, the reason I went this route is that I'm colourblind enough so that colour chart based tests are all but useless for me. Given I keep apistos (and now shrimp) who are generally more susceptible to ammonia / nitrogen and other chemicals, being able to accurately monitor water chemistry is something I haven't really been able to do in the past. What does it do? Well in short it’s a lab quality water chemistry tester. You still need reagents (powders or liquids depending on what you’re testing for) and the tests do take a while to get the results: from the point of adding the reagents, the tests can take anywhere from 3:30-6 mins to run. But while you’re waiting on the test results, you can start preparing the next test. Benefits: well essentially the biggest benefit, other than doing away with colour charts, is the accuracy of the results. Additionally, within one test, you can get multiple results – although you probably don’t need the additional tests results it gives in all cases: eg. with the ammonia Low Range test, you can also get ammonium mg/l and ammonia-nitrogen. Although not exactly sure the difference between each of these, if they’re stable relationships anyway and to what impact they have on aquarium inhabitants – I need to do more reading. The phosphate test gives three different readings as well (Phosphate, Phosphorous and Triphosphorus Pentoxide…) Hahaha Yeah, I’ve no idea on that last one is either, except the chemical symbol is P3O5. The HI 83203 can test many different water parameters: I currently use if for: Ammonia LR, Nitrates, Nitrites LR, Phosphates (and I also have pH tests if I want to verify my constant pH monitor panel in the tank.) It’s pretty easy to use, with easy to understand instructions. It can also keep a history of your results – up to 200 individual measurements. There’s also the capability of linking it to your computer. Powder reagents are packaged in pre-measured amounts for ease of use. Would I recommend this unit? Absolutely. But only if you’re running more than one tank and only if your livestock have specific water parameter requirements. It definitely is overkill for anyone who can use colour charts without an issue and it definitely does a lot more than I’m using it for (hence the price) but I’m enjoying finally being confident in knowing the water chemistry of my tanks. Tips on purchasing: I went though Hanna Instruments Australia. There are cheaper overseas retailers online but for the sake of local warranty and support, it’s worth the few extra bucks to buy local. The reagents are also not cheap but they usually come in boxes of 100-200 tests. I also got a couple of their handheld meters, like a new TDS tester as my old one was really old and would need a replacement electrode anyway.