Martial Inventor

Your inventive prowess is well known among the Artisan Guilds and some of the more wealthy patrons of the local area. Your reputation is enough to gain you food and drink among those who recognize you as well as assistance with construction and workshop time/space when among those of your (or a similar) guild or among those who are familiar with you and your work.

Gadgets:

Auto Pick- This item can be used to open locks. The DC it can pick is equal to your Intelligence score. It takes at least five times as long to open the lock, plus one minute for every DC lower it is. After it is used, it becomes inert.

Breathing Kit- This small device increases the amount of time a Medium creature can hold its breath by one minute. For small creatures, this time is increased by two minutes. After it is used, it becomes inert.

Clockwork Toy. This toy is a clockwork animal, monster, or person, such as a frog, mouse, bird, dragon, or soldier. When placed on the ground, the toy moves 5 feet across the ground on each of your turns in a random direction. It makes noises as appropriate to the creature it represents.

Concealable Item- Note: This item does not break, nor does it have a limit to craft; but it does cost gp. equal to the base price of the item +100gp. and follows normal crafting rules. You may create a shield or light weapon that folds in on itself. As a bonus action, you may deploy this item or collapse it. When folded, you have advantage on Sleight of Hand (Dexterity) checks made to hide this item on your person.

Explosive Bomb- You may throw this metal shere at a point within 40ft. of you. All creatures within 5ft. of that point must make a Dexterity saving throw against your Spot DC or take 3d4 Piercing damage.

Fire Starter. The device produces a miniature flame, which you can use to light a candle, torch, or campfire. Using the device requires your action.

Flash Bomb- You may throw this metal cylinder at a point within 40ft. of you. All creatures within 5ft. of that point must make a Constitution saving throw against your Spot DC or be Blinded for one minute. On every turn thereafter the target may attempt another Constitution saving throw, ending this effect on a successful save.

Grapple Launcher- This small contraption is capable of firing a grappling device attached to a 100ft. long chord used to get up high. This item otherwise functions as a hand crossbow for determining proficiencies and properties.

Image Caster- One sheet of paper may be inserted into this small box at a time. As an action, you may press a small button on the side of this device, which releases a flash of light in a 30ft. cone, and after one hour the paper is shaded with coal, graphite, or other materials to create an image of what the Image Caster was facing. The image comes only in shades of grey, unless dyes worth 50gp are used.

Improved Reload- This device increases the amount of times one can fire a hand crossbow before needing to reload. When applied, the crossbow can fire three bolts before requiring an action to load three more.

Long Jump Soles- It takes one minute to affix this device to the soles of one's shoes or feet, doubling their jump distance and height. If the wearer lands on their feet but suffers any damage due to falling, these devices become inert.

Music Box. When opened, this music box plays a single song at a moderate volume. 
The box stops playing when it reaches the song’s end or when it is closed.

Noise Maker- This small device can imitate sounds: such as footsteps, a door closing or opening, an item crashing to the ground, or other simple noises. This item functions for one minute and then becomes inert.

Net Gun- This device is capable of firing nets toward opponents. When using this device, you may throw nets out to a range of 15ft. with a long range of 30ft. This item otherwise functions as a light crossbow for determining proficiencies and properties.

Smoke Bomb- You may throw this metal canister at a point within 40ft. of you, creating a 15-foot-radius of smoke centered on a point within range. The sphere spreads around corners, and its area is heavily obscured. It lasts for five rounds or until a wind of moderate or greater speed (at least 10 miles per hour) disperses it.