Every fix starts with a question—and deserves a straight answer. The FS899L delivers that. We built it for the midnight fixer: True RMS, colour screen, USB-C, CAT.III 1000V safety, at a fair price. Our rule: can a non-electrician get a reliable reading in 30 seconds? Is it safer? Would we trust it in a dark garage at midnight? Three yeses, or it doesn't ship. ZMIWNIED: zero mystery in wiring.
How did we get our start?
1AM garage. Cheap meter, jumping reading. Two hours wasted on phantom. Meter was culprit, not car. That night birthed a decision. Market lacked a meter for that moment—poor light, no backup, just you and circuit. So we built ZMIWNIED. No VC hype. Just fixers for fixers.
What problem are we solving?
One test: would we trust it at midnight in a dark garage alone? No? It doesn't ship. FS899L has CAT.III 1000V/CAT.IV 600V, dual fuses, full protection, True RMS 6000-count, CE/RoHS. Not for show—for safety. Quality is a quiet promise; you won't notice when it works
FS899L Digital Multimeter
FS899L Digital Multimeter (20pcs)
Package Content:
- 1 x Digital Multimeter
- 2 x Test Leads
- 1 x Instruction Manual
- 1 x Charging Cable
- 1 x Packaging Box
2026 Upgraded FS899L Digital Multimeter
A USB rechargeable, auto-ranging digital multimeter designed to solve electrical issues at home or on the job site.
Product Features:
- True RMS for Accurate Readings: Delivers precise measurements of AC/DC voltage, current, resistance, capacitance, and temperature thanks to its 6000-count true RMS technology.
- USB-C Rechargeable: Built-in rechargeable battery provides up to 8 hours of continuous use and charges conveniently via USB-C.
- Bright Color Display: Large, easy-to-read backlit screen with data hold function and a built-in flashlight for working in dark spaces.
- Non-Contact Voltage (NCV) Detection: Quickly and safely detect live wires without touching them.
- Built to Last: Tough, impact-resistant housing helps protect against drops and daily wear and tear on the job.
- Plug-and-Play Simplicity: No complicated setup—just turn it on and start diagnosing. Perfect for both DIYers and professionals.
 2026 Upgraded FS899L Digital Multimeter, Color Screen, USB-C with 16pcs Silic... |  FS899L Digital Multimeter Tester, 2026 Upgraded, 6000 Counts True RMS AC/DC V... |  FS899L Digital Multimeter, 2026 Upgraded, 6000 Counts True RMS, Auto-Ranging,... |  2026 Upgraded FS899L Digital Multimeter, 6000 Counts True RMS Auto-Ranging AC... | 2026 Upgraded FS899L Digital Multimeter Tester with Color Screen, USB C Recha... | |
|---|---|---|---|---|---|
| Price | — | — | — | — | — |
| Test Tool Suite | 16pcs Silicone Multimeter Test Leads Kit | NO | 22pcs Silicone Multimeter Test Leads Kit | 2 Alligator Clip Test Leads | 16pcs Silicone Multimeter Test Leads Kit |
| Accuracy | 6000 Counts, True RMS | 6000 Counts, True RMS | 6000 Counts, True RMS | 6000 Counts, True RMS | 6000 Counts, True RMS |
| Voltage | 60mV–600V ±1.2% | 60mV–600V ±1.2% | 60mV–600V ±1.2% | 60mV–600V ±1.2% | 60mV–600V ±1.2% |
| Current | 300mA–10A ±2.2% | 300mA–10A ±2.2% | 300mA–10A ±2.2% | 300mA–10A ±2.2% | 300mA–10A ±2.2% |
| Functions | NCV + Temperature + Frequency | NCV + Temperature + Frequency | NCV + Temperature + Frequency | NCV + Temperature + Frequency | NCV + Temperature + Frequency |
| Display | 4.8-inch Backlit Screen + Work Light | 4.8-inch Backlit Screen + Work Light | 4.8-inch Backlit Screen + Work Light | 4.8-inch Backlit Screen + Work Light | 4.8-inch Backlit Screen + Work Light |
| Power | USB-C Fast Charging, 8-Hour Battery Life | USB-C Fast Charging, 8-Hour Battery Life | USB-C Fast Charging, 8-Hour Battery Life | USB-C Fast Charging, 8-Hour Battery Life | USB-C Fast Charging, 8-Hour Battery Life |
| Safety | CAT III/IV Dual Certification + Dual Fuses | CAT III/IV Dual Certification + Dual Fuses | CAT III/IV Dual Certification + Dual Fuses | CAT III/IV Dual Certification + Dual Fuses | CAT III/IV Dual Certification + Dual Fuses |
2026 Upgraded FS899L Digital Multimeter
Package Content:
- 1 x Digital Multimeter
- 2 x Test Leads
- 1 x Instruction Manual
- 1 x Charging Cable
- 1 x Packaging Box
A USB rechargeable, auto-ranging digital multimeter designed to solve electrical issues at home or on the job site.
Product Features:
- True RMS for Accurate Readings: Delivers precise measurements of AC/DC voltage, current, resistance, capacitance, and temperature thanks to its 6000-count true RMS technology.
- USB-C Rechargeable: Built-in rechargeable battery provides up to 8 hours of continuous use and charges conveniently via USB-C.
- Bright Color Display: Large, easy-to-read backlit screen with data hold function and a built-in flashlight for working in dark spaces.
- Non-Contact Voltage (NCV) Detection: Quickly and safely detect live wires without touching them.
- Built to Last: Tough, impact-resistant housing helps protect against drops and daily wear and tear on the job.
- Plug-and-Play Simplicity: No complicated setup—just turn it on and start diagnosing. Perfect for both DIYers and professionals.
2026 Upgraded FS899L Digital Multimeter, Color Screen, USB-C with 16pcs Silic... | FS899L Digital Multimeter Tester, 2026 Upgraded, 6000 Counts True RMS AC/DC V... | FS899L Digital Multimeter, 2026 Upgraded, 6000 Counts True RMS, Auto-Ranging,... | 2026 Upgraded FS899L Digital Multimeter, 6000 Counts True RMS Auto-Ranging AC... | 2026 Upgraded FS899L Digital Multimeter Tester with Color Screen, USB C Recha... | |
|---|---|---|---|---|---|
| Price | — | — | — | — | — |
| Test Tool Suite | 16pcs Silicone Multimeter Test Leads Kit | NO | 22pcs Silicone Multimeter Test Leads Kit | 2 Alligator Clip Test Leads | 16pcs Silicone Multimeter Test Leads Kit |
| Accuracy | 6000 Counts, True RMS | 6000 Counts, True RMS | 6000 Counts, True RMS | 6000 Counts, True RMS | 6000 Counts, True RMS |
| Voltage | 60mV–600V ±1.2% | 60mV–600V ±1.2% | 60mV–600V ±1.2% | 60mV–600V ±1.2% | 60mV–600V ±1.2% |
| Current | 300mA–10A ±2.2% | 300mA–10A ±2.2% | 300mA–10A ±2.2% | 300mA–10A ±2.2% | 300mA–10A ±2.2% |
| Functions | NCV + Temperature + Frequency | NCV + Temperature + Frequency | NCV + Temperature + Frequency | NCV + Temperature + Frequency | NCV + Temperature + Frequency |
| Display | 4.8-inch Backlit Screen + Work Light | 4.8-inch Backlit Screen + Work Light | 4.8-inch Backlit Screen + Work Light | 4.8-inch Backlit Screen + Work Light | 4.8-inch Backlit Screen + Work Light |
| Power | USB-C Fast Charging, 8-Hour Battery Life | USB-C Fast Charging, 8-Hour Battery Life | USB-C Fast Charging, 8-Hour Battery Life | USB-C Fast Charging, 8-Hour Battery Life | USB-C Fast Charging, 8-Hour Battery Life |
| Safety | CAT III/IV Dual Certification + Dual Fuses | CAT III/IV Dual Certification + Dual Fuses | CAT III/IV Dual Certification + Dual Fuses | CAT III/IV Dual Certification + Dual Fuses | CAT III/IV Dual Certification + Dual Fuses |
Every fix starts with a question—and deserves a straight answer. The FS899L delivers that. We built it for the midnight fixer: True RMS, colour screen, USB-C, CAT.III 1000V safety, at a fair price. Our rule: can a non-electrician get a reliable reading in 30 seconds? Is it safer? Would we trust it in a dark garage at midnight? Three yeses, or it doesn't ship. ZMIWNIED: zero mystery in wiring.
How did we get our start?
1AM garage. Cheap meter, jumping reading. Two hours wasted on phantom. Meter was culprit, not car. That night birthed a decision. Market lacked a meter for that moment—poor light, no backup, just you and circuit. So we built ZMIWNIED. No VC hype. Just fixers for fixers.
What problem are we solving?
One test: would we trust it at midnight in a dark garage alone? No? It doesn't ship. FS899L has CAT.III 1000V/CAT.IV 600V, dual fuses, full protection, True RMS 6000-count, CE/RoHS. Not for show—for safety. Quality is a quiet promise; you won't notice when it works
FS899L Digital Multimeter
FS899L Digital Multimeter (20pcs)