Of course everyone can point to anomalies in any system, where a higher end unit may ultimately pass a problematic cable, but that may not necessarily be the fault of the unit as much as a environmental issue.
If a client is asking for certification and you are charging them for this work, then you better be using a certifier; plain and simple.
In fact many RFP, will request certification be done by a few qualifying products (Fluke DSX series being a standard)
We own multiple, of various brands, of cable "testers" as they work just fine. 99.99% of the time if they pass on these low end devices the cable works as it should for the customer.
The point being though, if a customer is requesting certification, you better be charging for this and give them what they want.
There are a ton of certifiers in the used market right now, so finding an affordable one shouldn't be an issue.
