Bluetooth Low Energy Coin - temperature sensor - 200m range - waterproof - 5 year battery
https://www.calculus.group/shop/ble-bi-temp-coin-bluetooth-low-energy-coin-temperature-sensor-200m-range-waterproof-5-year-battery-504
https://www.calculus.group/web/image/product.template/504/image_1920?unique=ad04090
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