SigmaWit Log Cloud and ULogs Cold Chain Loggers

SigmaWit is a Shenzhen-based manufacturer of cold chain temperature and humidity data loggers. The company runs a 5,000 square metre factory with more than 50 engineers and positions itself as an end-to-end visual solution provider that combines sensors and IoT for the cold chain.

The range covers single-use and reusable loggers, Bluetooth loggers, 4G and WiFi real-time trackers, ultra-low temperature loggers and thermo-hygrometers. Data is gathered in the Log Cloud IoT system, which offers web, Android and iOS apps and private deployment. Typical uses are fruit and food transport, vaccine transport and commercial monitoring, with OEM and ODM projects supported.

• Single-use loggers: ULogs, BLogs and BULogs series for one-way shipments.
• Reusable loggers: ULogm2s and BLogm2 for repeated cold chain use.
• Real-time trackers: 4G and WiFi loggers that report during transit.
• Ultra-low temperature loggers: devices for deep-freeze shipments.
• Log Cloud IoT system: web, Android and iOS apps with private deployment.
• OEM and ODM: custom logger development for partners.

Exporters of dragon fruit, durian or seafood can place single-use loggers in reefer containers and share reports with buyers. Pharmaceutical distributors can use reusable loggers for vaccine shipments. Cold storage operators can add Bluetooth thermo-hygrometers.

Covers disposable, reusable and real-time loggers from one vendor, so one cloud can serve several shipment types. Cloud access through web and mobile apps with a private deployment option. OEM and ODM support allows custom logger projects. Large production capacity cited at 5,000,000 units per year.

Demand for verified temperature records is growing with exports of fruit, seafood and vaccines. Vietnam and Southeast Asia ship large volumes of perishable produce and need low-cost loggers that prove cold chain integrity to importers.

Shenzhen, China. Company site uses the names Shenzhen Juzhi Technology and Shenzhen SigmaWit Technology. 5,000 square metre factory, 3,000 square metre R&D area, 200+ workers. ULogs4A launched March 2026.