The load cell attached to the gauge contains mineral oil. This load cell is sealed with lip seals or "o" rings. The seals wear out and cause an oil leak. If the oil is to low, the gauge will not indicate pull force accurately. The seals must be replaced. The assembly must be evacuated, oil filled then calibrated. Please send your load cell to Com-Ten for repair.

Your analogue fastener tester can be converted to digital. Depending on the gage size, the load cell may have to be changed. Please contact Com-Ten for details.

The force gauge may need to be reset. To reset remove the batteries. Allow the gauge to reset with no batteries for 5 minutes. Install the batteries and try again. If the display does not work correctly return the load cell to Com-Ten Industries for repair.

Force readings are converted to pressure readings by dividing the force reading by the specimen cross sectional area. For example if your peak force reading is 100 pounds and the measured cross section of the specimen is 0.50 inches, peak pressure is 100 / 0.05 or 200 pounds per square inch(PSI). If you are using other force or deflection units, the formula still applies but the result units will vary accordingly. Kg/mm. Nt/meter ect.

Try removing the batteries. Wait 5 minutes then install the batteries. If this does not help please return the gauge cell to Com-Ten Industries for repair.