101Leafy researched the game with the Hilltop Works fan translation patch, English translation by Cargodin
EMF Meterマグネ・メーター
EMF Meter is item 47 of the game's item table, in the Items group. The script never names it.
Detects magnetic energy, a qi flow
気脈のひとつ、マグネ気を計るメーター。
It never shows up on its own in a talk with a picture, so it has none here.
Item table: Sawdust 4 EMF Meter Connie's Hand Mirror
English translations by Cargodin for Hilltop Works Fan Translation Patch: https://www.patreon.com/hilltopworks/posts/kowloons-gate-160555525?collection=18503