Offering this Gossen Luna Pro S with case for $15 plus shipping & Paypal. Can't guarantee functionality or accuracy, as I don't have the PX-625 battery on hand to test it, and buying two of those batteries would cost more than $15 (LOL).

Having said that, I see no reason why it won't work, and in the case that you try it and it's completely non functional (slight inaccuracy does not apply), I'll refund the money sans shipping cost.