Fiddling Malfunction Table, d100
1     - Device immediately triggers
2-11  - Device is rendered half as effective on next use
12-21 - Device is rendered ineffective on next use
22-31 - Device is rendered ineffective for one round
32-46 - Device is rendered ineffective for two rounds
47-56 - Device is rendered ineffective for three rounds
57-76 - Device is rendered ineffective until repaired
77-96 - Device is rendered half as effective until repaired
97-99 - Device is rendered ineffective permanently
100   -   Device falls apart

Science Check Malfunction Table, d100
1     - Device immediately triggers, then falls apart
2-25  - Device is rendered ineffective until repaired
26-75 - Device is rendered ineffective permanently
76-85 - Device falls apart
86-95 - Device falls apart with fanfare (i.e. belches black smoke, produces sparks, makes awful screeching noise)
96-99 - Device tears itself apart spectacularly (i.e. slams itself into a wall, pistons overwork and pull device apart)
100   - Device explodes