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24 best detector under CHF 20.00

We picked 24 detector from AliExpress with real orders and good reviews. Prices go from CHF 1.59 to CHF 15.03, the average rating is 4.7 stars and the most popular one has 53.2k orders. Every product opens on AliExpress, where you pay with buyer protection.

Updated: 2026-11

  1. 1Non-Contact Voltage Detector Pen 12-1000V AC Tester, Live Wire Breakpoint Finder, Electric-57%Non-Contact Voltage Detector Pen 12-1000V AC Tester, Live Wire Breakpoint Finder, Electrical OutletCHF 3.44 CHF 8.00★ 4.9 · 53.2k soldView on AliExpress →
  2. 2MUFASHA Non-Contact Voltage Detector Electrical Pen AC Voltage Tester Smart Breakpoint Fin-58%MUFASHA Non-Contact Voltage Detector Electrical Pen AC Voltage Tester Smart Breakpoint Finder 12-100CHF 3.95 CHF 9.44★ 4.7 · 48k soldView on AliExpress →
  3. 3Universal Battery Tester ANENG BT173 Battery Detector Test C D AA AAA N 9V Cell Button Met-50%Universal Battery Tester ANENG BT173 Battery Detector Test C D AA AAA N 9V Cell Button Meter Visual Display TeCHF 3.94 CHF 7.88★ 4.8 · 26.8k soldView on AliExpress →
  4. 4ANENG 11-25V Relay Detector RT01 Digital Universal 4/5 Pins Car Battery Vehicle Detection-58%ANENG 11-25V Relay Detector RT01 Digital Universal 4/5 Pins Car Battery Vehicle DetectionCHF 7.82 CHF 18.45★ 4.7 · 10.1k soldView on AliExpress →
  5. 5ANENG B16 Lntelligent Sensing Digital Measuring Pen Non-Contact 12V-300V Voltage Detector -57%ANENG B16 Lntelligent Sensing Digital Measuring Pen Non-Contact 12V-300V Voltage Detector NCV VoltagCHF 3.61 CHF 8.30★ 4.8 · 9.7k soldView on AliExpress →
  6. 6KONNWEI MAXOBD Bluetooth OBD2 Scanner Auto Engine Code Reader Car Diagnostic Detector Supp-57%KONNWEI MAXOBD Bluetooth OBD2 Scanner Auto Engine Code Reader Car Diagnostic Detector SuppCHF 13.21 CHF 31.01★ 4.9 · 4.3k soldView on AliExpress →
  7. 7AITHEA USB Rechargeable PIR Motion Sensor LED Bar Lights Dimmable Detector Night Light Por-73%AITHEA USB Rechargeable PIR Motion Sensor LED Bar Lights Dimmable Detector Night Light PorCHF 2.27 CHF 8.48★ 4.5 · 4k soldView on AliExpress →
  8. 8OBD2 Scanner ELM327 Car Diagnostic Detector Code Reader Tool V1.5 WIFI Bluetooth OBD 2 for-56%OBD2 Scanner ELM327 Car Diagnostic Detector Code Reader Tool V1.5 WIFI Bluetooth OBD 2 forCHF 3.28 CHF 7.40★ 4.9 · 3.5k soldView on AliExpress →
  9. 9Bluetooth ELM327 OBD2 Car Code Reader Scanner V1.5 Fault Detector Check Engine Automotive-67%Bluetooth ELM327 OBD2 Car Code Reader Scanner V1.5 Fault Detector Check Engine AutomotiveCHF 2.43 CHF 7.34★ 4.9 · 3.3k soldView on AliExpress →
  10. 10Relay Detector 11-25V ANENG RT01 Digital Universal 4/5 Pins Car Battery Vehicle Detection-58%Relay Detector 11-25V ANENG RT01 Digital Universal 4/5 Pins Car Battery Vehicle DetectionCHF 8.79 CHF 20.72★ 4.7 · 3k soldView on AliExpress →
  11. 111PC Brake Fluid Tester High Precision Portable Use Safety Quality Assurance OBD2 Brake Oil-58%1PC Brake Fluid Tester High Precision Portable Use Safety Quality Assurance OBD2 Brake Oil DetectorCHF 3.78 CHF 9.02★ 4.8 · 2.8k soldView on AliExpress →
  12. 12Propane Butane Sensor 12V Gas Detector Sensor Alarm LPG Natural Motor Home Camper Marine L-60%Propane Butane Sensor 12V Gas Detector Sensor Alarm LPG Natural Motor Home Camper Marine LCHF 6.48 CHF 16.40★ 4.9 · 2k soldView on AliExpress →
  13. 13HT5009 Brake Fluid Tester Digital Auto Brake Liquid Oil Detector Tool-57%HT5009 Brake Fluid Tester Digital Auto Brake Liquid Oil Detector ToolCHF 13.04 CHF 30.62★ 4.9 · 1.9k soldView on AliExpress →
  14. 14ANENG RT01 Relay Tester Aermotor 11-25V Car Battery Voltage Detector LED Indicator Light A-55%ANENG RT01 Relay Tester Aermotor 11-25V Car Battery Voltage Detector LED Indicator Light ACHF 8.85 CHF 19.53★ 4.6 · 1.2k soldView on AliExpress →
  15. 15KONNWEI BK300 Lead Acid Starting Car Battery Detector 12V 24V Capacity Resistance Bluetoot-53%KONNWEI BK300 Lead Acid Starting Car Battery Detector 12V 24V Capacity Resistance BluetootCHF 13.19 CHF 28.06★ 4.6 · 717 soldView on AliExpress →
  16. 16Multifunctional Handheld Metal Detector Stud Wood Finder Electronic Measuring Instrument E-54%Multifunctional Handheld Metal Detector Stud Wood Finder Electronic Measuring Instrument Electronic WallCHF 6.72 CHF 14.60★ 4.5 · 695 soldView on AliExpress →
  17. 173 in 1 Wall Metal Detector Depth Professional Find Metal Wood Studs AC Voltage Live Wire D-50%3 in 1 Wall Metal Detector Depth Professional Find Metal Wood Studs AC Voltage Live Wire Detect Wall ScannerCHF 15.03 CHF 30.07★ 4.9 · 635 soldView on AliExpress →
  18. 18Fish Tank Thermometer LCD Digital Aquarium Temperature Water Meter Aquarium Temp Detector Fish Tank Thermometer LCD Digital Aquarium Temperature Water Meter Aquarium Temp Detector Fish Alarm PetCHF 2.61★ 4.5 · 567 soldView on AliExpress →
  19. 19SEAMETAL Car Vehicle Motor Tire Pressure Pen Detector Air Pressure 5-50PSI Mini Test Meter-61%SEAMETAL Car Vehicle Motor Tire Pressure Pen Detector Air Pressure 5-50PSI Mini Test MeterCHF 1.59 CHF 4.06★ 4.6 · 560 soldView on AliExpress →
  20. 20ANENG BF01 Brake Fluid Tester Oil Quality Check Detector Universal Brake Liquid Digital Ve-58%ANENG BF01 Brake Fluid Tester Oil Quality Check Detector Universal Brake Liquid Digital Vehicle AutoCHF 12.54 CHF 29.52★ 4.9 · 479 soldView on AliExpress →
  21. 21Risingon Car Parktronic LED Parking Sensor Kit Radar Display Backup Monitor Detector Syste-23%Risingon Car Parktronic LED Parking Sensor Kit Radar Display Backup Monitor Detector SysteCHF 10.47 CHF 13.67★ 4.7 · 305 soldView on AliExpress →
  22. 22Hidden Camera Detector Anti-Spy Car GPS Tracker Listening Device Bug RF Wireless All Signa-55%Hidden Camera Detector Anti-Spy Car GPS Tracker Listening Device Bug RF Wireless All Signal Scanner GadgetCHF 13.60 CHF 30.47★ 4.6 · 272 soldView on AliExpress →
  23. 23Car Battery Leakage Detector Parasitic Battery Drain Tester with Fuse Safe No-Disconnect C-54%Car Battery Leakage Detector Parasitic Battery Drain Tester with Fuse Safe No-Disconnect Current Leak FinderCHF 6.38 CHF 13.99★ 5.0 · 236 soldView on AliExpress →
  24. 24High Precision 100Psi Car Tyre Pressure Gauge Long Hose Tire Meter Detector-53%High Precision 100Psi Car Tyre Pressure Gauge Long Hose Tire Meter DetectorCHF 7.00 CHF 14.90★ 4.6 · 213 soldView on AliExpress →

Prices and ratings come from AliExpress and can change. We may earn a commission when you buy through our links, at no extra cost to you.

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