DUOYI best sellers

#1 Fuel Injector Cleaner DUOYI Fuel Injector Cleaner Kit Universal Fuel Injector Tester And Cleaner Kit,8 Pulse Modes Fuel Injector Cleaning Kit,DIY Fuel Injector Cleaner Tool with 6 Size Cleaning Adapters,12V/5V Output Power

$19.99 on Amazon

#2 🔥 Digital Manifold Gauge DUOYI Digital Manifold Gauge Set Air Conditioning/Refrigerator Digital HVAC Gauges Double Pressure&Temp Test Air Conditioning Tools & Equipment Manifold HVAC with Tricolor Hose, 2 Pairs of Test Clamps

$119.99 on Amazon

#3 Refrigeration Digital DUOYI Refrigeration Digital Manifold Gauge Set HVAC Vacuum Gauge +Temp Sensor Hoses

$169 on Ebay

#4 46PCS Compression and DUOYI 46PCS Compression and Leakage Test Kit Petrol & Diesel Compression Tester Kit Automotive Cylinder Leak Down Tester with Dual Gauge Engine Compression Tester Kit for HDI, TDCi, Pumpe Duse Engine

$159 on Amazon

#5 🆕 Compression and Leakage DUOYI Compression and Leakage Test Kit 46PCS Petrol & Diesel Engine Compression Tester Automotive Cylinder Leak Down Tester Kit with Dual Gauge Engine Compression Tester Kit for HDi, TDCi, Pumpe Duse Engine

$149 on Amazon

#6 DY519 3 in 1 HVAC Digital DUOYI DY519 3-in-1 HVAC Digital Manifold Vacuum Gauge Refrigerant Charging, Vacuum Testing & Leak Detection 24 Refrigerant NIST Compatible High Precision Pressure Meter for AC Pros & DIYers

$59.99 on Amazon

#7 🔥 2PC Temperature Clamps DUOYI 2PC Temperature Clamps HVAC Digital Manifold Gauge Set Digital Refrigerant Gauge

$25.99 on Ebay

#8 1pc New DUOYI DY294 Digital 1pc New DUOYI DY294 Digital Transistor DC Parameter Tester US

$52.26 on Ebay

#9 🆕 Portable Non contact DUOYI Portable Non-contact Three-Phase Meter Tester Motor Rotation Indicator with LED

$35.99 on Ebay

#10 Digital Gauges HVAC 92 DUOYI Digital Gauges HVAC 92 Refrigerant Recharge Kit, Digital Manifold Gauges HVAC Pressure & Air Tightness Test, Air Conditioning Tools & Equipment with Tricolor Hose, for Cold Storages/Refrigerators

$85.99 on Amazon

#11 Bearing Puller 21 in 1 DUOYI Bearing Puller 21-in-1 Bearing Puller Kit No Damage to Bearing Removal Tool Internal Bearing Puller Set Bearing Separator and Puller Set with Three-Jaw Puller Blind Hole Bearing Puller Set

$20.79 on Amazon

#12 Refrigeration Digital DUOYI Refrigeration Digital Manifold Gauge HVAC Vacuum Pressure Leak Temperature Test

$125 on Ebay

#13 2PC Temperature Clamps DUOYI 2PC Temperature Clamps / Probe Clip 1.5m Length for HVAC Digital Manifold Gauge

$25.99 on Ebay

#14 ONE Duoyi DY4300B 4 Terminal ONE Duoyi DY4300B 4-Terminal Earth Resistance 400~500Hz Soil Resistivity Tester

$289.50 on Ebay

#15 Manometer Gas Pressure DUOYI Manometer Gas Pressure Tester ±241.3Kpa/35Psi Wide Range Digital Manometer Lp Gas Pressure Tester with 11 Pressure Units, MAX/MIN/AVG Measurement, Data Storage/Hold, 9V Battery

$45.99 on Amazon

#16 🔥 Earth Resistance Tester DUOYI Earth Resistance Tester 0.03-2000 ohm Meter,Upgraded Digital Earth Ground Resistance Tester 2/3 Wire Measurement AC/DC Voltage Meter with Batteries,Tool Bag

$99 on Amazon

#17 Earth Ground Resistance DUOYI Earth Ground Resistance Tester 0.03-2000Ω Soil Resistivity Meter,Upgraded Earth Resistance Tester Auto Measurement 600V AC Ground Voltage Meter with 6pcs 1.5V Batteries,Tool Bag

$89.99 on Amazon

#18 Brake Fluid Tester Automotive DUOYI Brake Fluid Tester Automotive Brake Fluid Detector DOT3/DOT4/DOT5.1 Brake Fluid Moisture Tester High Precision Brake Fluid Liquid Tester,Auto Brake Diagnostic Testing Tool Brake Fluid Content Tester

$19.99 on Amazon

#19 Turbo Boost Leak Tester DUOYI Turbo Boost Leak Tester Kit 10Pcs Turbo System Leakage Tester Kit with 4 Pairs of Stepped Adapters 1-3/8" to 3-1/2" Turbo Pressure Leakage Tester for Turbo,Radiators,Cooling,Emissions System

$29.99 on Amazon

#20 Exhaust Back Pressure DUOYI Exhaust Back Pressure Tester 2.5" HD Pressure Gauge Exhaust Back Pressure Gauge Kit with 6ft Hose Oil Pressure Gauge Shockproof Rubber Cover Exhaust Pressure Gauge,Car Exhaust Pressure Tester

$39.99 on Amazon