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⚡5000V High Voltage Output
Test insulation on heavy‑duty equipment like transformers, motors, and high‑voltage cables. Select from 500V, 1000V, 2500V, or 5000V to match your application.
📏Measure Up to 200GΩ
Wide resistance range from 1MΩ to a massive 200GΩ (200,000MΩ). Handles everything from low‑voltage circuits to high‑impedance insulation.
🛡️Dual‑Function: Insulation Tester + AC Voltmeter
Not just a megohmmeter – also measures AC voltage up to 750V. One tool for both insulation testing and general voltage checks.
🔦Large Backlit LCD & HV Warning Light
68×55mm display with bright backlight for easy reading in dark areas. The red HV LED clearly shows when high voltage is active, keeping you safe.
✅Professional High‑Voltage Capability at an Affordable Price
You don’t need to spend a fortune to get 5000V test voltage and 200GΩ range. The BT-6688B delivers lab‑grade performance for field use – ideal for electricians, maintenance technicians, and industrial engineers on a budget.
✅Solve Real‑World Testing Challenges
Surface leakage giving you false readings?Connect the GUARD terminal to eliminate errors caused by moisture or dirt on the test object.
Worried about capacitive discharge?The built‑in protection and automatic discharge handling keep you safe after testing capacitors or long cables.
Need to verify voltage presence?Switch to ACV mode and check up to 750V without carrying a second meter.
✅Built for the Toughest Jobsites
The rugged, shockproof case withstands drops and bumps. Dustproof and moisture‑resistant design means you can use it outdoors or in dusty industrial environments without worry.
✅Fast, Intuitive Operation Saves You Time
No complicated menus – just select your test voltage, press TEST, and read the result. The HV LED instantly confirms high voltage is present, and the large backlit display is easy to read even in dim light.
1 × BTMETER BT-6688B High Voltage Insulation Resistance Tester
1 × Set of Dedicated Test Leads (with alligator clips and probes)
1 × User Manual
Note: Batteries are not included. Please use 6×AA 1.5V batteries (alkaline recommended). Product specifications and appearance are subject to the actual item received. Refer to the user manual for complete operating usContact usPayment

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