Key Takeaways
1. No smartwatch can accurately measure blood glucose without an external device like a CGM.
2. Many low-cost smartwatches falsely claim to feature blood sugar monitoring.
3. Germany’s Federal Network Agency removed numerous dubious smartwatches from the market due to misleading measurements.
4. In 2025, there was a decrease in dubious online listings for smartwatches, but violations still represented millions of units sold.
5. Inspections revealed that 58% of devices evaluated did not meet necessary requirements, affecting around 1.9 million devices.
There is no smartwatch available today that can accurately measure blood glucose levels without needing an external device like a continuous glucose monitor (CGM). Nevertheless, many low-cost smartwatches are marketed claiming they have a blood sugar monitoring feature.
Market Oversight
According to Germany’s Federal Network Agency, some of these smartwatches were previously sold in the country until they were removed from the market. The discrepancies between the “measurements” provided by such smartwatches and actual blood glucose levels can be seen in our review of the Kospet iHeal 6.
In 2025, the Federal Network Agency identified 1,266 dubious online listings, which is an 11.2% decrease compared to the year before. These listings reportedly represent around five million units sold. The majority of violations in this area were linked to smartwatches, primarily due to fake sensor readings, as well as failures to comply with the Radio Equipment Act.
Device Evaluations
Last year, the Federal Network Agency conducted inspections on 2,400 types of devices sold in retail. Out of these, 58% did not meet the necessary requirements, affecting about 1.9 million devices sold. Although many of these issues weren’t serious safety concerns—like the absence of CE marking or user manuals not available in German—there were still significant findings.
Additionally, the agency reported finding products, including PV inverters and network switches, with dangerously high interference levels that could potentially disrupt wireless communications, broadcasting, and military signals. Customs officials halted the import of 359,000 products, with 8,202 shipments flagged as suspicious, of which 89% did not adhere to the regulations.
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