OSALO Scientific Calculator 417 Function 2 Line 10+2 Digits Written Display Solar and Battery Calculators for Students Secondary School College Black (OS 991ES Plus 2nd Edition)

Fantastic. Accurate. Big numbers. Thats what i needed

Perfect for what we need at school!

Working well - no issues .

Sturdy calculator. Doesnt feel cheap or anything which is great. Its very easy to use. Didnt take little getting used to but the instruction of the buttons on the inside of the case do massively help. Took this into my Level 2 Electrical exam and passed being able to comfortable answer all questions that had equations. Highly recommend

A simple and easy to use product which does the job for my daughter who has just started secondary school. I would recommend this for anyone else.

This review comes in two parts: first the OS-82MS Plus (the cheap one) and then the OS-991ES Plus (the expensive one) OS-82MS Plus =========== This is a strange beast! It's a ... let's be kind and call it a 'tribute' to an earlier era of Casio calculator, but at its current price-point of £13.99, it's more expensive than two ACTUAL Casio calculators; the FX-83GTX and the FX-85GTX, at £13.97 and £11.99 respectively. These offerings from Casio are significantly easier to use, with a more up-to-date screen layout and I honestly can't see a reason why you wouldn't prefer them. I bought this calculator out of morbid curiosity, wanting to know, first, if it worked and then, what was on the inside. The first thing that jumped out at me was that it... works. It's fine actually. It does the job and that's good. The build quality is a little bit lacking; you might not want to drop it into the middle of a school-bag that's going to be kicked around. If you press the case - even gently - near the screen, the LCD gets quite unhappy. Maybe that's what they mean by 'light-touch calculator'. The second thing I noticed - and this is a consideration if you're buying budget (ahem) calculators...that you're probably going to want to hold onto it for quite some time. Maybe it'll be inherited by younger siblings, or maybe you'll be taking it to university with you, or whatever. But in either of these cases, you're going to want to be able to replace the batteries. And on this calculator... I'd be inclined to call it 'non-user-serviceable'. With a bit of patience, skill, and the right tools, I was able to get the back off... or as this calculator is constructed, get the front off... to get at the batteries, but when I reassembled it (two attempts, as the screen had shifted the first time) the casing was not unscathed. There's a good chance that you'd break this calculator if you tried to replace the batteries, but in fairness to the manufacturer, the batteries aren't soldered in place like on some other cheapo(!) calculators. You can see this in the picture attached which shows two button-cells in the top right-hand corner of the calculator. Do everyone a favour and get the actual Casio calculator. And if £11.99 is still looking a bit on the expensive side, Renus make knock-off Casios of a slightly earlier vintage for £6.99 that do everything this one does, are more robust, and don't have the idiotic battery issue. OS-991ES Plus ============ So following my purchase and dismantling of the above calculator, I also bought the more expensive OS-991ES Plus, and I have to say it makes a better fist of things. The battery is replaceable without dismantling the calculator. It also has a solar panel which is both connected and works. I see other reviewers have suggested that the solar panel is a fake, but in the example sent to me at least, it's the real deal and I was able to use the calculator with the battery removed. You will be able to see that it is connected in the second picture - the one with a single button-cell on the top-right hand corner of the calculator. This calculator has a modern display, more similar to the Casio fx-991EX than the older fx-991ES which it resembles. It still feels flimsy, but it isn't. You can press the case around the screen without upsetting the display. You can (if you should wish) dismantle the case in a non-destructive way, without requiring anything more sophisticated than a small screwdriver and your fingernails, but there is no need to open the case unless you're... me, really. This calculator is better than the older Casio (fx-991ES) and seems to be as good as the current (fx-991EX), and represents a 20% saving in cost against its big-name equivalent... at least at time of writing. I'm quite impressed by this one, really. If you want the full range of statistical/base-number/matrix functions but money is tight, I'd say go for it.

Really great product

good