Specifications include, but are not limited to: Check that unit is properly hung with the proper manufacturer's hanger. Remove the extinguisher from its hanger. Check the gauge pressure. Check the condition of the gauge and its compatibility with the extinguisher. Check the weight of the extinguisher. Check that the last hydro-test test date is within code requirements. Check the last 6-year maintenance inspection for compliance, if applicable. Check the last 12-year maintenance inspection for compliance, if applicable. Check the valve and shell for damage or corrosion. Remove the hose and inspect it for cracks or splits. Check the hose threads for signs of wear. Perform conductivity test on hose, per NFPA Check the condition of the discharge horn. Check for obstructions that interfere with accessibility of the extinguisher. Break the extinguisher seal and remove the locking pin. Check the upper and lower handles. Replace safety disk, if necessary. Verification of service collar, replace if necessary.