So the new one you just posted a link to . TMT one. Could that be used in a professional capacity in the future once I've done college In a couple of years. Or does it not meet the standard and lacks capability ?
The new unit that
@pc1966 suggested would be fine for Insulation Resistance (IR) tests, which is basically "pressure testing" cables. I'm actually having slight doubts it is also intended to be an accurate continuity tester, i.e. that it can measure resistances to the nearest 0.01 ohms. I looked and couldn't see the range/accuracy information, so I could be wrong.
If on a budget then the most bang for your buck is probably a Megger BM or MIT, which can be calibrated and used professionally. Either would be fine.
Ebay is full of units like this:
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Find many great new & used options and get the best deals for Megger BM223 Insulation And Continuity Tester at the best online prices at eBay! Free delivery for many products.
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You'd need a set of test leads with the 2nd one.
Either of those gives you 50% of what you need for professional testing.
You could later add a loop tester and RCD tester, or a unit that does both. But it is likely you will want the convenience of an all-in-one multifunction tester that does all the tests: insulation resistance, continuity, earth loop impedance tests, and RCD tests. (at a minimum).
(Even if you do plan to get an MFT one day, having a 2nd IR tester is very useful when fault finding, so getting a continuity and IR tester is still a good investment IMHO)