Your question threw me -- I was thinking Pentair doesn't make kits! But, they bought Rainbow several years back, and you have one of the Rainbow kits.
The Rainbow OTO / phenol red kit is fine. Their CYA test kit is probably also fine. But the DPD tablet kit is not so fine. DPD tablets bleach out, and give a zero reading if the chlorine gets a little high, so people add even MORE chlorine, which is also not so fine.
The Taylor kit is the cheapest complete kit with a DPD-FAS test for chlorine, which allows accurate tests up to 50 ppm. But, if you already have a complete Rainbow kit, you can buy just the DPD-FAS test, rather than the whole kit.
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