Included batteries are ultra cheap, be sure to remove them before they start to leak. No need to immediately toss them, just don't leave them in a flashlight you plan to keep in the car etc.
Meters are OK, probes are terrible. Spend $5 or so on ebay and get some better ones. Be sensible in use, do NOT use on higher voltages or currents, even checking a normal AC circuit make very sure the meter is on the correct setting.
BTW not sure on the hotness of this deal since its been the same deal for a decade. Best free items are the tape measures, gloves, scissors, and screwdriver sets. Flashlight not so much, not that they are decent flashlights, but once you switch to good quality rechargeable batteries its cheaper to buy a $5 single AA type flashlight than to buy 3x AAA batteries.