As a dedicated air ion detector manufacturer based in Shenzhen, ONETEST has introduced the second-generation KEC900+II series negative air ion detector, a measuring instrument built for forestry research, air purifier verification and anion product testing. The new series keeps the proven parallel-electrode platform of the KEC900+ generation while replacing the control board with an intelligent microchip programme, German-imported standard components and an intelligent sampling fan — giving laboratories, quality control teams, distributors and OEM brands a faster, more repeatable way to read ion concentration in ambient air.

Measuring Positive and Negative Ions With One Handheld Instrument

The KEC900+II detects both positive and negative ions in the air using the internationally adopted parallel electrode measurement principle. Because the sampling fan holds a constant airflow of 1.4 m/s and ion mobility is calibrated at 0.15 cm²/V·sec, readings stay consistent between operators and between units — a critical requirement when the same instrument has to be trusted across a factory line, a test house and a customer site. Determination accuracy is better than ±20%, and the backlit LCD presents the instantaneous value, the maximum hold value and the mean measurement on the same screen, with one-click zeroing for a clean baseline before every batch.

The instrument is supplied with selectable ranges so that a single model line can serve both low-concentration indoor air studies and high-output ion generator testing:

Product Features

• Measures both positive and negative ions with a single handheld unit.
• Produced by a participating unit of the group standard for the national Air Anion Measurement Instrument Performance Test Specification.
• High measurement accuracy, sensitive response and strong anti-interference capability.
• Multiple range options to match different concentration environments.
• Simple operation, supported by a matching operation video for fast operator training.
• LCD readout showing mean and maximum measurement simultaneously.

Where the KEC900+II Is Used

Because the same instrument covers indoor and outdoor air, the KEC900+II is widely specified for:

1. Air purifiers and ion generators — verifying declared negative ion output before shipment.
2. Forestry and environmental research — comparing ion concentration across forest plots, green belts and urban control points.
3. Anion health products and anion building materials — demonstrating functional claims in showrooms and trade fairs.
4. Nano coating and functional finishes — incoming and outgoing inspection of coated surfaces.
5. Third-party testing laboratories — a portable reference instrument for on-site sampling.

Why Buyers Work With ONETEST

ONETEST has focused on air ion measurement instruments for years, and every unit ships from Shenzhen with a traceable calibration approach built on standardised sampling rather than assumptions. Commercial terms are deliberately kept simple for distributors and project buyers: minimum order quantity of one piece, T/T payment, supply ability of 500 pieces per month and a delivery window of five to ten working days. Each detector is packed in a protective aluminium case, then in an export carton, so instruments arrive ready for resale or immediate deployment on site.

For partners evaluating a long-term air ion detector manufacturer, the KEC900+II series offers a practical balance of measurement credibility, field portability and stable supply — the three factors that most often decide whether an anion product claim can be defended in front of a buyer, a auditor or a forestry research committee. Sample units and full technical documentation are available on request.