Mix together the pectin and instant clearjel into the sugar.
JAM
Put the strawberries and rhubarb in a heavy duty dutch oven. Add the pectin/sugar mixture and stir. Bring to a boil and add the lemon juice. Keep on low boil for 10 minutes.
FILL JARS
Place a funnel on the jar and fill leaving 1/4" headspace.
Wipe around the perimeter of the jar with a damp cloth to remove any spilled jam. Use the magnetic lifter to place a lid on the top of the jar and add bands.
CANNING (WATER BATH METHOD)
Place jars into the canner and add enough water to cover the jars 1-2". Set the regulator valve to exhaust. Press the WB/Steam button and the Start button and set to 10 minutes. Wait for steam to start coming out (about 10-15 minutes).
Once the steam starts, press the start button again.
After the 10 minute cycle has completed, unplug and let the valve release naturally.
Remove jars with the jar lifter and place on a countertop.
Let jars sit still for 12-24 hours. Make sure all the lids have popped in the center to know they have sealed. If not, place jam in the refrigerator and use within 2 weeks.