Recently, the editor came across an anecdote that was both unexpected and a source of pride—this story simply had to be shared:

The Nagiv CTG series high-precision current sensors submitted by the customer for testing unexpectedly revealed a surprising coincidence during calibration at a third-party, authoritative metrology institution: the core reference equipment used for calibration was none other than the CTF series fluxgate current sensor that Nagiv had delivered many years earlier.

In other words, the customer took the latest factory‑new Nagivolt product to the “judge” for testing, only to discover that the judge’s standard gauge , was also manufactured by Nagivolt!

This unexpected coincidence not only validates the professional prowess of nGV products, but also prompts one to marvel: even the “referee” is using our own technology.

Clever, yet not clever: the inevitability within chance

This scene struck even the on-site engineers as rather dramatic: their own product was being used as a “yardstick” for another one of their products. Such a coincidence is extremely rare in the metrology field, yet it objectively underscores two points:

First, Nagifu’s current sensors boast sufficiently high accuracy and stability—so exceptional that they have been used for extended periods by professional metrology institutions as measurement standards. The selection of a metrology institute is never arbitrary: equipment capable of serving as a “reference standard” must maintain extremely low time drift, temperature drift, and zero-point drift over periods spanning several years or even more than a decade, while exhibiting very high linearity and outstanding repeatability. Nagifu’s products from many years ago continue to serve as “yardsticks” on the front lines of metrology, which in itself stands as a silent testament to their technical prowess.

Second, the customer’s trust and the metrology institute’s product selection have achieved “double validation” at nGV. Customers choose nGV products for testing because they trust our accuracy; the metrology institute selects nGV products as reference standards because they need the most reliable equipment to calibrate other sensors. When these two choices converge in the same laboratory, and the comparison results still perfectly match the 0.01% accuracy specified in the product manual, this is no longer just advertising—it is a fact.

An interesting “closed loop”

Even more intriguing is the logic underlying the entire measurement process:

Measurement standard (high-grade nanovolt CTF series sensor) → Measured object (newly manufactured CTG-3000D175) → Test result (accuracy 0.01%)

This means that NAGIV has leveraged its own past to validate its present—using higher‑precision metrology‑grade products to test new offerings at the industrial‑test level. The final results fully met specifications, demonstrating not only that our products consistently deliver outstanding, stable performance across generations and product lines, but also underscoring the high degree of continuity and reliability inherent in NAGIV’s technological roadmap.

Customer feedback: This carries more weight than any certificate

When the customer learned of this “coincidence” in the experiment, they couldn’t help but exclaim: “We originally just submitted the product for routine testing, but we never expected to witness such a scene. For a company’s products to be used by the Institute of Metrology as a metrological reference—this in itself is far more convincing than any marketing claim. We made the right choice!”

True recognition isn’t self-promotion; it’s being quietly “put to use” by peers and authoritative institutions.

In many industries, the highest form of recognition is not customer praise, but rather when your product becomes the “standard” in others’ hands.

Thanks to its long-term stable performance and excellent measurement accuracy, the nGV fluxgate current sensor has been successively procured by numerous provincial-level and higher metrology institutions across China over the years, and is employed in the establishment of current measurement standards and in traceability efforts.

And this experience, in a manner that is almost “coincidental” yet highly symbolic, has brought this recognition vividly before our eyes: the customer sent Nagifu’s products to a third-party testing institution, only to discover that the core equipment used by that institution to establish its metrological standards also came from Nagifu.

In other words, the product you submitted for testing is being “evaluated” against another high‑grade Nagivolt product; and the final results demonstrate that both the CTF series—serving as the metrological reference—and the CTG series—used as the test subject—have delivered satisfactory performance.

regarding CTG-3000D175

CTG-3000D175 is one of the flagship models launched by nGV for high-current, high-precision measurement applications:

. Rated range: 3000Adc

. Overcurrent: 3600Adc, 3000Arms

. Aperture: 175 mm (can accommodate large-size busbars or copper bars)

. Output mode: current output; with an optional PSU power supply, the integrated IVC converter can be configured to provide a high-precision voltage signal.

. Accuracy class: 0.01%

Comparative advantage: This current sensor features open-circuit protection, providing safeguarding in the event of an output open circuit and preventing hazardous voltages induced at the output from damaging the current sensor.

Application areas: metrological calibration, test fixtures, instruments and meters, laboratory reference standards, high-current testing for new energy applications, and more.

Conclusion

A chance sighting has revealed the subtle yet profound standing of nGV products in the professional field. We never deliberately tout our capabilities—because when you step into the laboratories of authoritative metrology institutions and see “Wuxi nGV” nameplates proudly affixed to the reference equipment they use every day, everything speaks for itself.

nGV — a high-precision current sensor developed by Chinese engineers.