The Megger CB101 is a precision calibration box built for UK electrical contractors, maintenance electricians and test technicians using insulation testers. It lets you verify your tester’s accuracy across multiple resistance levels under high-voltage conditions, saving time and ensuring reliable, compliant insulation testing.
Why use the CB101 Calibration Box for your insulation tester?
When you rely on accurate insulation resistance readings, the CB101 gives you a quick reference using four high-voltage resistors designed for test voltages up to 5 kV DC. That means whether you’re on-site doing commissioning, maintenance or periodic testing, you can check that your insulation tester is still providing correct results before you trust it with live job data.
Order today to enjoy free delivery expert support and our 90-day satisfaction guarantee. Need advice? Our team is here to assist you.
Calibration certificate with actual resistor values
User manual / datasheet
Why choose Instrotech for your electrical test equipment?
With over 40 years’ experience supporting UK electricians, technicians and engineers, Instrotech is your trusted partner for quality tools and expert service. When you purchase from us, you benefit from:
Free UK shipping on all orders
Access to our knowledgeable technical support team
Available calibration services to maintain safety compliance
A 90-day money-back guarantee for complete peace of mind
We’re committed to helping you work safely and efficiently with industry-leading products and ongoing support.
