DW833 2-in-1 Automotive Relay & Circuit Tester

Ditch the hassle of carrying multiple diagnostic tools for every auto electrical job. This upgraded all-in-one tester combines a 3.5-36V DC circuit probe and a 12V/24V 4/5 pin relay diagnostic tool into one portable device. Perfect for professional mechanics, fleet technicians, auto electricians, and at-home DIY car repair enthusiasts.

 

Key Features

• ✅ 2-in-1 Multifunction Design: Combines circuit voltage tester and automotive relay tester in a single unit, covering all common automotive electrical diagnostic needs
• ✅ Wide Testing Range: Supports DC 3.5V–36V circuit testing, plus 12V and 24V 4-pin & 5-pin automotive relay testing
• ✅ Built-in LED Work Light: Integrated bright LED illuminates dark engine bays and tight work spaces for clear testing at night or low-light areas
• ✅ Clear Digital LCD Display: High-contrast digital screen shows real-time voltage, delivering accurate and intuitive readings at a glance
• ✅ One-Click Output Switch: Fast toggle between positive and negative output for quick polarity checks and continuity testing
• ✅ Comprehensive Diagnostics: Tests voltage, polarity, continuity, short circuit, leakage, coil drive and relay engagement performance
• ✅ Universal Compatibility: Works on 12V passenger cars, 24V trucks, commercial vehicles and heavy-duty construction machinery

 

Full Specifications

Parameter	Details
Model	DW833
Brand	Lingxiang
Circuit Test Range	DC 3.5V – 36V (NOT for 220V AC)
Relay Test Voltage	12V / 24V
Supported Relays	4-Pin & 5-Pin automotive relays
Display	Digital voltage LCD screen
Indicator Lights	Red = Positive (+) / Green = Negative (-) / Ground
Work Light	Built-in LED
Operating Temp	-20°C ~ +55°C
Weight	Approx. 310g
Dimensions	30 × 12 × 5 cm

 

Easy Operation Guide

Circuit Testing (DC 3.5V – 36V)

1. Connect power: Attach red clip to battery Positive (+), black clip to Negative (-)
2. Select your output mode using the one-click toggle switch
3. Touch probe to test point — display shows live voltage, indicator lights show polarity
4. Read results: Red = Positive, Green = Negative/Ground, No light = No voltage present

Relay Testing (12V/24V 4/5 Pin)

1. Set the mode switch to match your 4-Pin or 5-Pin relay type
2. Plug the relay firmly into the test socket on the tester
3. Press TEST button — automatically checks for sticking contacts, coil burnout and abnormal engagement
4. Visual indicators confirm if the relay is in good condition or faulty

 

⚠️ Important Safety Information

• DC use ONLY: Never connect to 220V AC household power — may cause permanent damage and electric shock hazard
• Correct polarity required: No built-in reverse polarity protection. Always match Red to Positive, Black to Negative
• Keep device dry. Do not operate in rain, snow or wet working environments
• Do not disassemble or modify — unauthorized disassembly will void the product warranty
• Always select the correct relay mode to ensure accurate test results

 

Package Includes

• 1 × DW833 Automotive Circuit & Relay Tester
• 1 × Set of power connection clips (Red + Black)
• 1 × Test probe
• 1 × User manual
  Vehicle and relays are NOT included

 

Service Guarantee

• Fast shipping with full tracking number provided for every order
• 30-day hassle-free money-back guarantee for all purchases
• 24/7 responsive customer support — all inquiries answered within 24 hours
• Professional technical support for all product and operation questions

Legal Disclaimer

This is a professional-grade automotive diagnostic tool. Buyer is responsible for safe operation and adherence to proper procedures. Seller assumes no liability for improper use, incorrect connections, or any damages resulting from product use. Always follow vehicle manufacturer guidelines. Consult a certified automotive technician if you are unsure of proper operation.