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Water Tank Level Transmitter Wholesale direct from Wanlin Fire Protection — 12-year factory experience, LoRaWAN Wireless Liquid Level Monitor (WL-LT300) certified CE/FCC/RoHS/REACH. Key specs: LoRaWAN/LoRa wireless, 3km range, ultra-low power, 0-20m measurement, 0-20m range. MOQ 200pcs, OEM/ODM available.