lightmeter +HVX200a + redrock m2 with flip?

I know there is an ASA for the HVX I forget what it is. But what about when in use with the redrockm2 and microx which takes 1.5 stops?
 
The HVX is rated at 320 ASA, minus one stop is 160 ASA, minus a half is 120 ASA.
 
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