Meet the ONETEST-501-II – The Smart Choice from a Trusted Economical Air Ion Tester Manufacturer
As awareness of indoor air quality and the wellness benefits of negative ions grows worldwide, demand is rising for reliable yet affordable air ion testers—not just for labs, but for homes, retailers, and hobbyists.
At CESTSEN by Shenzhen Wanyi Technology, we’ve engineered the ONETEST-501-II Air Negative Ion Tester specifically to bridge this gap: a cost-effective, high-performance solution that delivers professional-grade results without the premium price tag.
Whether you’re a homeowner testing ion-emitting paint, a travel enthusiast comparing forest vs. city air, or a retailer demonstrating negative ion products, the ONETEST-501-II is your perfect companion.

Key Features of the ONETEST-501-II
Optimized for Low-Concentration Environments:
Ideal for measuring typical indoor air (0–100,000 ions/cm³) and weak emissions from ion-releasing materials like:
Negative ion coatings & wall paints
Functional textiles (curtains, bedding)
Eco-friendly wood panels & flooring
Flat-Plate Electrode Principle:
Uses the internationally recognized Gerdien tube flat-plate method for stable, repeatable readings with excellent oxidation resistance and fast response time
Premium Imported Components:
German-made standard parts for long-term calibration stability

Intelligent sampling fan ensures consistent airflow across the sensor

Perfect For:
Homeowners evaluating air quality after renovation
DIY enthusiasts testing “negative ion” home products
Travelers & Nature Lovers comparing ion levels in parks, mountains, or beaches
Retailers & E-commerce Sellers providing live demos of ion-generating goods
Educational Use in schools or science projects