A lot depends on where you are and the fuel used. I do a lot of injectors and some are good and a lot are filthy, if you use only the ultrasonic cleaner in the machine you are not going to deep clean them.
One poster here had a set that Porsche cleaned for him but it still had a hot hard starting issue so he sent them to me from Germany as a last resort. They tested good and seemed to be clean until I put them in the 1200w 4 inducer sweep tank with a powerful solvent then one shot way up and the others showed some improvement.
To make a long story short after cleaning in 3 different tanks all came up more than 20%, he tried them and the car started right up hot, issue resolved.
I find a lot of very dirty filters that restrict the flow and on some DI injectors the filters are burned right out of them literally. The ohms can be checked at home but that doesn't tell you the electrical consumption of each individual injector, the ohms can be spot on but the injector can still be bad.
Bosch and Denso injectors failures are rare but GM Multec, Magneti Marelli and Siemens/Deka have an astronomical failure rate, I did a 1990 ZR1 that had 16 Multec injectors, all ohms were okay but current draw wad bad on 7 of them, they guy wanted to keep it original so he dug up another set so I could match them up. Out of 32 injectors we ended up with 24 good ones so he had 8 spares.
I have a big box full of bad injectors that gets thrown out when its full for scrap.
If someone wants to try this at home I suggest getting getting an EM276 so you can at least pulse them when cleaning and replace the filters (PM me and I will tell you how to get them out) I can supply O rings and filters if needed. The chemicals I use are only available in 5 gallon minimum and cost a lot but simple green is the best and safest cleaner to use if you don't have that.
The best way to do it is to check the ohms remove the filters, stand them up in a container through holes in cardboard with the cleaner about half way up the injector, pulse it with the EM276 and with an eyedropper put the cleaner down the injector and stop the pulse. Let it sit overnight then pulse each one in the ultrasonic tank.
Its not going to give you flow rates or a thorough electrical test so you can tell how good they are but you will get some junk out.
https://www.amazon.com/ALLOSUN-EM27...sr=8-4&keywords=fuel+injector+testor