With accuracy of or with an accuracy of?

I am trying to write a paper for publishing. In writing one sentence, I am doubtful which way of writing would be correct.

A Differential Pressure (DP) transmitter with a maximum working pressure of 2000 psi and accuracy of ± 0.02% reading was used to measure the pressure drop across the core.

A Differential Pressure (DP) transmitter with a maximum working pressure of 2000 psi and an accuracy of ± 0.02% reading was used to measure the pressure drop across the core.

Thanks