Vacuum meter very good quality resistant to falls
and quite accurate user manual unfortunately in English but very helpful and rich in necessary information I think that for this money it is hard to get better equipment
I recommend this vacuometer.
It performs sensationally. You just need to put chokes on the hoses (cutting the hoses 10 cm from the end on the engine side) - as described in the manual.
They are useful for cleaning nozzles. These are not ordinary wires, but like microscopic conifer files. they have a fine abrasive surface. I recommend.