Tool Upgrade Priority Guide
Spend your Research Points wisely — each Zone unlocks new upgrades, but you can only pick one per pair. Here's the optimal path.
Tool Upgrade System
As you progress through the 5 Zones, you unlock new tool upgrades purchased with Research Points (RP). Most tools offer two upgrade choices per tier — you can only pick one. Choosing the wrong upgrade can make late-game inspections much harder.
Earning Research Points
Research Points are earned by sending survivors to the Laboratory for symptom research. Each new symptom discovered grants RP.
Discover New Symptoms
Send infected survivors to the Lab. Each unique symptom identified earns RP.
Zone Progression
Reaching a new Zone unlocks the next tier of upgrades for purchase.
Zombie Cage Research
The $40,000 Zombie Cage allows advanced research on contained zombies for additional RP.
Recommended Upgrade Order
Follow this priority to maximize inspection efficiency. Color Indicators are always the best value — they give instant visual feedback.
Each zone presents a choice between two upgrades. The recommended pick is marked with a star.
Color Indicator shows orange/red for abnormal vitals at a glance. Sound Cues are useful but visual feedback is faster and more reliable.
Clear View removes blood and mud from survivors, revealing hidden symptoms. Wider Cone increases scan radius but isn't as impactful.
Color Indicator color-codes breathing sounds (green/orange/red), making the hardest tool much easier. Amplified Sensors enlarge black zones but don't simplify diagnosis.
Faster Layer Switching speeds up the most time-consuming tool. Titanium Head only increases zombie damage — not useful for inspections.
Autofocus auto-adjusts to the current layer, drastically improving Matioscope efficiency. Smart Filter removes irrelevant lung zones — helpful but less impactful if you already have Color Indicator.
All Tool Upgrades
Complete list of every upgrade available for each tool, organized by unlock zone.
Thermopulsometer
Measures body temperature and pulse rate. Essential for detecting fever and elevated heart rate symptoms.
| Zone | Upgrade | Cost | Effect | Verdict |
|---|---|---|---|---|
| Zone I | Sound Cues | 50 RP | Adds sound cues for thermal and pulse measurements | Decent |
| Zone I | Color Indicator | 50 RP | Adds orange and red indicators for high and extreme values | Recommended |
Scanner
Full-body scanner that reveals external symptoms. Primary tool for initial screening of survivors.
| Zone | Upgrade | Cost | Effect | Verdict |
|---|---|---|---|---|
| Zone II | Wider Cone | 75 RP | Increases Scanner detection radius for broader coverage | Good |
| Zone II | Clear View | 75 RP | Allows the Scanner to see through blood and mud on survivors | Recommended |
Stethoscope
Listens to breathing patterns at lung spots. Difficult to master without upgrades due to many similar-sounding breath types.
| Zone | Upgrade | Cost | Effect | Verdict |
|---|---|---|---|---|
| Zone III | Color Indicator | 100 RP | Adds color filter for normal, nonspecific, and infected breathing sounds | Recommended |
| Zone III | Amplified Sensors | 100 RP | Tuned sensors for enhanced audio clarity and enlarged black zones | Decent |
| Zone V | Smart Filter | 150 RP | Removes irrelevant lung zones, only showing meaningful spots | Good |
Matioscope
Inspects survivor eyeballs for microorganisms. The hardest tool to use — requires focusing through multiple layers.
| Zone | Upgrade | Cost | Effect | Verdict |
|---|---|---|---|---|
| Zone IV | Faster Layer Switching | 125 RP | Increases speed of switching between ocular layers | Recommended |
| Zone V | Autofocus | 150 RP | Matioscope automatically focuses on the current layer | Recommended |
Hammer
Tests neurological reflexes by striking the forearm. Simple to use but only applicable when specific visual cues are present.
| Zone | Upgrade | Cost | Effect | Verdict |
|---|---|---|---|---|
| Zone IV | Titanium Head | 125 RP | Increases damage to zombies during encounters | Skip |
RP Spending Strategy
Make every Research Point count with these strategies.
General Strategy
- Always pick Color Indicators when available — visual feedback is the biggest time-saver
- Don't rush to spend RP. If neither option feels critical, save for the next Zone
- Prioritize upgrades for tools you use most often (Scanner and Stethoscope)
- Hammer Titanium Head is a trap — it helps combat, not inspections
Earning More RP
- Send every unknown-symptom survivor to the Lab instead of liquidating immediately
- Track which symptoms you've already discovered to avoid wasting Lab slots
- Build the Zombie Cage ($40,000) for late-game RP farming
- Don't quarantine survivors with already-known symptoms — focus on unknowns
Tool Mastery
- Learn to use tools without upgrades first — upgrades enhance, not replace skill
- Practice Matioscope on known-infected survivors to learn organism patterns
- Stethoscope is hardest without Color Indicator — temporarily rely on other tools for breathing symptoms
- Scanner + Thermopulsometer handle 80% of cases in early zones