For those engaged in testing electronic components, cables, and insulating materials, do you often encounter these challenges: insufficiently precise test voltages, inaccurate measurements in high-resistance ranges, no standardized procedures for surface/volume resistivity testing, or data fluctuations caused by environmental interference?
At Hope Instruments, we understand the challenges faced by modern testing laboratories and production facilities. That’s why we present a “Golden Partnership” solution that directly addresses all these pain points!
01. HT3530/3530A High-Precision Wide-Range Insulation Resistance Tester
This instrument is the “all-in-one brain” for your insulation testing.
Extremely Wide Measurement Range Covering All Scenarios
Featuring an ultra-large testing range of 500Ω to 9.9×10¹⁵Ω, spanning from low to ultra-high resistance, with automatic/manual switching between seven measurement ranges fully compatible with electronic components, devices, and cables across all applications.
Precise Voltage Control
The HT3530 insulation resistance tester supports step-controlled outputs ranging from 0 to 1000V with 1V increments, while the HT3530A extends this range to 1–1500V, meeting testing requirements for various materials.
Unsurpassed Precision and Reliable Data
With a classification accuracy of 1%–20%, an open-circuit zeroing correction function throughout the process, and a maximum display capacity of 999,999 digits, every piece of data is verifiable.
Comprehensive Feature Upgrade
Not only does it measure insulation resistance and leakage current, but it also features unique surface and volume resistivity testing capabilities, along with a discharge function and multiple RS232/LAN/I/O interfaces, ensuring seamless compatibility for both laboratories and production lines.
02. HT0305 Electrode Box

A standalone main unit alone is insufficient; to accurately measure surface/volume resistivity, this “professional auxiliary” device must be used.
The HT0305 electrode box is a standard testing device deeply compatible with the HT3530 series.
Standard Electrode Design
The main electrode has a diameter of Φ50mm, while the protective electrode features an inner diameter of Φ60mm and an outer diameter of Φ80mm.
Electromagnetic Shielding for Interference Resistance
The shielding cabinet structure filters out external disturbances, ensuring stable and reliable data even in complex testing environments.
Versatile for All Scenarios
Whether on smooth panels or rough surfaces like carpets, it effortlessly performs surface resistance and volume resistance measurements, delivering direct resistivity results when paired with the main unit.
Flexible Configuration Options
The HT3530 and HT0305 are compatible with 1000V testing, while the HT3530A and HT0305A support 1500V high-voltage testing allowing you to choose exactly what you need without waste.
03. Why This Combination Is the Industry’s Preferred Choice

- Standard Compliance: Meets the resistivity testing standards for insulating materials; laboratory certifications and quality inspection reports are fully applicable.
- Maximal Efficiency: The host supports dual testing speeds of 1 test/second and 5 tests/second, combined with the electrode box’s one-touch testing feature, doubling the batch inspection efficiency of the production line.
- Reliable and Durable: The instrument is equipped with a discharge function to eliminate the risk of residual voltage after testing; the electrode box features a robust structure, ensuring stable accuracy over prolonged use.
- A One-Stop Solution: From insulation resistance and leakage current to surface/volume resistivity, a single set of equipment meets all insulation testing requirements, eliminating the need for multiple instruments.
The Core Competitiveness Lies in Conducting Testing with Accurate Data, High Efficiency, and Strong Compliance
The core competitiveness lies in conducting testing with accurate data, high efficiency, and strong compliance.
This premium combination of the HT3530 insulation resistance tester and HT0305 electrode box, available through Hope Instruments, has helped countless electronics, cable, and materials companies overcome testing challenges, offering comprehensive compatibility across all scenarios from R&D laboratories to production quality inspection lines.
If you’re also struggling with insulation testing challenges, Contact Hope Instruments provides the reliable testing solutions you need to maximize both testing efficiency and data accuracy.



