That's the reason I recommend them, accurate enough to know you have a problem and there not that worse than the liquid kits in terms of accuracy. Once you realise all kits are inaccurate it puts the strips ease of use into perspective.
I have a PH pen which is reasonable, can take up to 30 seconds to stabilise before you can take a reading unlike the TDS meter which is instant.
Having used play sand I would try and source something with a larger grain size if possible but it can work. Try not to go too thick, no more than 1 inch otherwise you can run into problems with toxic gas pockets forming as the sand gets compacted down and anaerobic bacteria form. The counter to this problem is to have fish or snails etc that burro through the sand and turn it over regularly.
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