The test fixture is a tool to scan the hashboard for possible failed ASIC chips, but it's not a tool to scan the whole unit, including the control board and PSUs.
The image you provided is the zeusbtc universal test fixture which is the upgraded version.
It is only worth buying if you have a large number of ASIC units but if you only have a single one I think better build a DIY version. You just need a few things the old control board of the Antminer S9 can be turned into a test fixture.
You don't trust professionals?
In Russia, a repairman will tell you that if you are so smart, then repair ASICs yourself
Chip failure can be noticed for indirect reasons, but if you don't have chips and equipment to replace them, then there is no point in buying a tester and wasting time on diagnostics.
I don't think he said that he doesn't trust professionals.
Not only in Russia or anywhere else, or even here in my country, if you feel like a tech-tumer (a combination of a customer that feeling technician.) Or even me, honestly, I usually said this to customers in the past: why not repair it with their own or DIY if they already have an idea?
This is pretty normal nowadays since most of the people are always asking Google and YouTube for some guides, but these customers end up bringing the unit to the repair shops because of lack of experience and tools. However, they are using it to say that you are asking too much (payment), but the solution should be simple. Once you heard that word as a technician, your blood will boil, and you'll end up telling them, "Why don't you DIY instead of bringing it to a professional?"
