The primary standard for calibrating vaccum is

McLeod gauge

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Dead weight tester

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Thermocouple gauge

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Kundsen gauge

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Solution

The correct option is A McLeod gauge
The pressure measured by the McLeod gauge is
$P = \frac{h^{2} A_{t}}{V}$
$A_{t} \Rightarrow$ tuba area
$V \Rightarrow$ volume of bulb of the tube
Hence, it is evident the unknown pressure is calculated in term of the physical dimensions of the gauge and hence this gauge can be used as standard for vaccum measurment.

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