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I can always count on you. What was life like before we met? Oh wait a moment, we've never met.
Two thoughts:
#1 Which regs does it not work on? The Allen wrench types or the older USD types?
#2 If yu buy an inline adjuster, get one that srpings away from the orifice under pressure.
This one is annoying:
2nd stage inline adjustment tool with gauge - IST - Pressure Checker Gauges - Scuba diving
this one is nice, but only works on the flat scredriver type crowns:
2ND STAGE INLINE ADJUSTMENT TOOL SCUBA GEAR PSI CHECKER - IST - Pressure Checker Gauges - Scuba diving