Product Description: The electronic oil meter gun with rigid tube and manual tip or flexible hose and semi-auto tip, with the appropriate connection to establish a controlled flow through the meter. Details of operation: Before putting into operation Check the technical data of the installation match with those of the lube meter Once the meter has been installed, please make sure that no air pressure shocks or particles can damage the meter Please check all connections to leakage Change the battery Button usage Feature: Show the exact amount of fluid dispensed Low battery indicator 4.4lb Easy to use Specifications: 5-digit liquid crystal display for both volume each time and total 4 units: L, GAL, PT, and QT 4 buttons: "move", "reset" (front of the meter), "1" and "2" (back.