Protimeter MMS replacement top cover Replacement cap for the latest generation of MMS moisture meters. Specifications Part number BLD9800CAP Application Current generation Protimeter MMS meters Confirm the generation before orderingProtimeter has produced several generations of the MMS, and the covers are not shared between them. This cap is for the latest generation. If you have an earlier MMS, or you are not certain which you have, send us a photograph of the meter and we will identify it rather than have you order twice. What the cover protectsThe top cover shields the integral pins and the probe socket. An open socket collects dust and moisture, and a dirty socket produces exactly the kind of intermittent reading that gets blamed on the probe. Tell us which Protimeter you run and we will confirm the right part before you order.