Monitoring 2nd Battery

Looking for a digital volt meter to monitor the volts on the 2nd battery, one that will be hard wired in.

What have others used and where to purchase?

Would like to monitor as have HF & VHF/UHF Amateur radio's fitted.

Battery has Isolator switch connected so will only charge after starter battery has 13.4v.

Have tried every place round here but to no avail.

Cheers
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