Apparently, it can not be made in the mobile version. This item can only be obtained by crafting and is never found in inmates' desks or sold by inmates. (Note: Both the shovel and pickaxe must be at 100% durability) There is no way to repair or upgrade a Multitool, so a larger operation will require entirely new tools. However, in TE2 the Multitool can only destroy 10 things total, walls or floor.
It is capable of digging 33 dirt spaces underground chipping through 20 wall blocks. The Multitool only degrades 1% per use (5% in TE2). It can be a fast way to increase others opinions of you, as you can give it to others. The Comb Shiv can be used as a weapon for beating up other characters in the game. Digging dirt underground takes 3 uses on a dirt space to clear it (33% on each dirt space, 50% per dig in TE2, meaning 2 hits), just like a Sturdy Shovel, and 5 uses to dig a hole up or down (20% per dig, also 50% per dig in TE2, also 2 hits). The Comb Shiv appears in all three Escapists games as a weak, but cheap to make melee weapon. First page contains the basic crafts from the classic game maps, with the intelligence needed to craft the item (all has been confirmed on the last version I played, 1.
Like a Sturdy Pickaxe it takes 5 uses on a wall to chip through (20% per successful chip), and can rapidly destroy rocks and walls. The Multitool is 5/5 for both digging and chipping.
The Multitool is the best digging/chipping tool in The Escapists and The Escapists 2.