testers black best sellers

#1 Handheld LED EMF Magnetic color tree Handheld LED EMF Magnetic Field Ghost Hunting Detector Electromagnetic Paranormal Equipment Tester 50Hz-20,000Hz Black

$13.99 on Amazon

#2 MP0514A 12V Digital Car MOTOPOWER MP0514A 12V Digital Car Battery Tester Voltmeter and Charging System Analyzer with LCD Display and LED Indication - Black Rubber Paint

$15.99 on Amazon

#3 Water Pressure Gauge MEASUREMAN Water Pressure Gauge, 0-200 PSI Water Pressure Tester with 2-1/2 Inch Dial & Durable 3/4 Inch Hose Thread, Ideal for Home, Hose Bib (Waterproof Case, Black)

$9.97 on Amazon

#4 Mold Test Kit for Home CCNZHA Mold Test Kit for Home -DIY Mold Testing Kit with 6 Individual Tests-Black Mold Detector-Indoor Air Quality Tester-Mold Identification Guide-Free Lab Analysis-Fast and Reliable Mold Detector at Home

$13.89 on Amazon

#5 Diamond Tester High Accuracy HQDZ Diamond Tester,High Accuracy Jewelry Diamond Tester Professional Diamond Tester Pen Jeweler Tool for Novice and Expert - Diamond Selector II 9V Battery Included(Black Diamond Testers)

$14.99 on Amazon

#6 Mold Test Kit for Home KAYENQO Mold Test Kit for Home - 6 Simple Detection Tests,Test HVAC System,Home Surfaces,&Indoor Air Quality Testing Kits,DIY black Mold Detector at Home,Includes Detailed Mold Identification Guide,air Tester

$13.89 on Amazon

#7 🔥 🆕 OBD2 Scanner Diagnostic VECOONEEN OBD2 Scanner Diagnostic Code Reader,Automotive OBD II Engine Light,Battery Tester,Mode 6, Mode 8 & I/M Readiness,OBDII Scan Tool for All OBDII Cars 1996+（Black）

$39.99 on Amazon

#8 Keychain Breathalyzer BACtrack Keychain Breathalyzer (Black) | Ultra-Portable Pocket Keyring Alcohol Tester for Personal Use

$39.99 on Amazon

#9 2 Pack Pet Training Mat SVD.PET 2-Pack Pet Training Mat with Tester, Pet Shock Pad, Dogs & Cats Electronic Repellent mat for Indoor, 3 Training Modes, 5 Levels, Pet Safe Mode (Black controler 60" X 12")

$69.99 on Amazon

#10 Instruments STK001 Non Contact Sperry Instruments STK001 Non-Contact Voltage Tester (VD6504) & GFCI Outlet / Receptacle Tester (GFI6302) Kit, Electrical AC Voltage Detector, Yellow & Black

$25.31 on Amazon

#11 TU 21Cylinder Leak Down YONLIGONJU TU-21Cylinder Leak Down Tester Kit, Automotive Engine Compression Leakage Test Kit for Cars Trucks Motorcycles (Black)

$27.99 on Amazon

#12 Portable Coin Ping Tester FESTEREKEY Portable Coin Ping Tester Kit – Sound Resonance & Diameter Check Tool with Ring Stick and Companion App – Black

$32.98 on Amazon

#13 Mascara Wands Disposable Teenitor Mascara Wands, Disposable Mascara Wand 200pcs, Lip Applicators Disposable Mascara Makeup Applicator Lipgloss Lip Brush Mascara Brush Lipstick Tester Wands Black

$6.29 on Amazon

#14 9038A Relay Bypass Switch PRISMORA 9038A Relay Bypass Switch, Relay Tester, Bypass Switch Kit with Amp Loop, 6-Pack, Black

$16.99 on Amazon

#15 15 Plug Audio Cable Tester MFL. 15-Plug Audio Cable Tester Line Finder Black 15-in-1 Cables Checker 10-Way Switch Wire Tracker with LED Indicators, Rectangular

$60.99 on Amazon

#16 Instruments GFI6302 GFCI Sperry Instruments GFI6302 GFCI Outlet / Receptacle Tester, Standard 120V AC Outlets, 7 Visual Indication / Wiring Legend, Home & Professional Use, Yellow & Black

$15.94 on Amazon

#17 🔥 Diamond Tester 40X HMKIS Diamond Tester + 40X Magnifier, 2025 New Jewelry Diamond Selector for Novice and Expert (Non-Rechargeable) (Black)

$18.99 on Amazon

#18 🆕 Breathalyzer 2026 Upgraded YYBCAN Breathalyzer, 2026 Upgraded Alcohol Breathalyzer Tester with USB Rechargeable & LCD Display, Portable Personal Breathalyzer for Home and Travel Use (Includes 10 Mouthpieces) (Black)

$39.99 on Amazon

#19 Diamond Tester ＋ 200g/0.01g HMKIS Diamond Tester ＋ 200g/0.01g Jewelry Scale + 30X 60X 90X Jewelers Loupe, Powered by USB & 9V Battery, Diamond Selector for Novice, Thermal Conductivity Meter(Non-Rechargeable) (Black)

$21.99 on Amazon

#20 M500 Insulation Tester/Electronic Supco M500 Insulation Tester/Electronic Megohmmeter with Soft Carrying Case, 0 to 1000 megohms Black

$95.59 on Amazon