{"product_id":"smart-multifunctional-water-leak-sensor-meross-ms420","title":"Smart Multifunctional Water Leak Sensor MEROSS MS420","description":"\u003cdiv style=\"font-size:1.1em;\"\u003e\n\u003ch2\u003eMeross MS420\u003c\/h2\u003e\n\u003cdiv class=\"context-badges\"\u003e \u003cspan\u003eFor water leak detection\u003c\/span\u003e \u003cspan\u003eNo need for a control panel\u003c\/span\u003e \u003cspan\u003eConnection via Wi-Fi\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003e A smart sensor for households that want to monitor the possibility of water leaks in places where damage can occur.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e Helps detect leaks near a washing machine or dishwasher.\u003c\/li\u003e\n\u003cli\u003e Useful for monitoring areas near a sink, bathtub or water heater.\u003c\/li\u003e\n\u003cli\u003e Suitable for the bathroom, kitchen or basement, where water leaks can cause inconvenience.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cbr\u003e\u003cbr\u003e\u003ch3\u003eSmart Multifunctional Flood Sensor MEROSS MS420\u003c\/h3\u003e\u003cp\u003e The smart multi-function flood sensor MEROSS MS420 helps protect your home from the consequences of water leaks, rainwater flooding and frozen pipes. Thanks to the large electrode surface, adjustable probe height and additional 1.5-meter cable, it can also monitor hard-to-reach places - such as the space under the washing machine or around pipes - and the water level in tanks. The sensor emits an audible alarm with a volume of 100 dB and allows you to set the conditions under which the alarm will be triggered. The device has a water and dust resistance level of IP65, and thanks to energy-efficient Bluetooth connectivity, it can operate on a single battery for up to 4 years. \u003c\/p\u003e\u003cp\u003e\u003cimg alt=\"Place the flood sensor on the aquarium wall and the probe under the device on the wet floor.\" border=\"0\" src=\"https:\/\/assets.innpro.pl\/25470\/33704\/3-f6ff45b8-2d23-4788-af0d-a47415c532e5.jpg\"\u003e\u003c\/p\u003e\u003ch3\u003e Accurate water detection and adjustable probe height\u003c\/h3\u003e\u003cp\u003e The large electrode surface area allows for the detection of even small amounts of water, allowing for quick detection of minor leaks. The adjustable probe height allows you to adapt the detection method to the surrounding conditions. At a low setting, the sensor reacts to small amounts of water, while a higher setting helps prevent false alarms caused by temporary surface moisture. The device can also detect a lack of contact with water, so it can monitor the water level in aquariums, tanks or animal feeders and alert you when the level drops. \u003c\/p\u003e\u003cp\u003e\u003cimg alt=\"Adjusting the height of flood sensor probes and examples of use at different water levels.\" border=\"0\" src=\"https:\/\/assets.innpro.pl\/25470\/33704\/2-3f286029-8ec4-4125-b337-c36d5a820d2f.jpg\"\u003e\u003c\/p\u003e\u003ch3\u003e Additional probe for hard-to-reach places\u003c\/h3\u003e\u003cp\u003e The included 1.5-meter probe cable allows you to extend the monitoring area without having to place the entire sensor in a place where there is a risk of flooding. The small probe also fits into narrow gaps, for example under a washing machine or dishwasher, near pipes and drains or behind furniture. This allows you to monitor areas where leaks could go unnoticed for a long time. The included adhesive tape makes it easy to attach an additional probe to the desired location. \u003c\/p\u003e\u003cp\u003e\u003cimg alt=\"Flood sensor installed under a leaking siphon flap, on a wet windowsill, and a picture showing the resistance icons.\" border=\"0\" src=\"https:\/\/assets.innpro.pl\/25470\/33704\/5-540949c4-42d9-4b54-a21e-2f7930ef5912.jpg\"\u003e\u003c\/p\u003e\u003ch3\u003e Smart notifications and fewer false alarms\u003c\/h3\u003e\u003cp\u003e The sensor detects leaks, monitors precipitation and warns of the risk of freezing. It also allows you to combine different conditions – such as the presence of water and low temperatures – so that the alarm is triggered only in certain situations. The ability to set a detection delay reduces the number of false alerts caused by short-circuits with water. In the event of a threat, the device activates a loud alarm, allowing you to respond faster and limit potential damage. \u003c\/p\u003e\u003cp\u003e\u003cimg alt=\"Using a water leak sensor under the bathroom cabinet and with a probe on the edge of the bathtub.\" border=\"0\" src=\"https:\/\/assets.innpro.pl\/25470\/33704\/8-68942ec2-d5f6-4426-81b8-12d1a9126224.jpg\"\u003e\u003c\/p\u003e\u003ch3\u003e Durable design and up to 4 years of operation\u003c\/h3\u003e\u003cp\u003e The IP65 housing protects the device from dust and water jets, making the sensor suitable for areas exposed to moisture. The operating temperature range of -20 °C to 60 °C allows for use in a variety of conditions. Bluetooth Low Energy (BLE) technology reduces power consumption, and the replaceable CR123A battery provides up to 4 years of operation. The device is compatible with smartphones with Android 8.0 or later and iOS 13 or later. \u003c\/p\u003e\u003cp\u003e\u003cimg alt=\"MS420-EU flood sensor on a windowsill and in an aquarium, with a diagram showing water level measurement.\" border=\"0\" src=\"https:\/\/assets.innpro.pl\/25470\/33704\/7-c4649a27-de29-4303-9421-06794f139366.jpg\"\u003e\u003c\/p\u003e\u003ch3\u003e Included in the package\u003c\/h3\u003e\u003cul class=\"list-disc pl-5\"\u003e\n\u003cli\u003e MEROSS MS420 Smart Flood Sensor\u003c\/li\u003e\n\u003cli\u003e Cable with additional probe\u003c\/li\u003e\n\u003cli\u003e CR123A battery\u003c\/li\u003e\n\u003cli\u003e Battery compartment opening tool\u003c\/li\u003e\n\u003cli\u003e User manual\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"table-wrapper\"\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e Manufacturer\u003c\/th\u003e\n\u003ctd\u003e Meross\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e Model\u003c\/th\u003e\n\u003ctd\u003e MS420\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e Device type\u003c\/th\u003e\n\u003ctd\u003e Smart multi-function flood sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e Wireless connectivity\u003c\/th\u003e\n\u003ctd\u003e Bluetooth Low Energy (BLE)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e Network\u003c\/th\u003e\n\u003ctd\u003e Wi-Fi required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e Alarm volume\u003c\/th\u003e\n\u003ctd\u003e 100dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e Power supply\u003c\/th\u003e\n\u003ctd\u003e 1 × CR123A battery (replaceable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e Protection level\u003c\/th\u003e\n\u003ctd\u003e IP65\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e Operating temperature\u003c\/th\u003e\n\u003ctd\u003e from -20°C to 60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e Operating humidity\u003c\/th\u003e\n\u003ctd\u003e 10-90% relative humidity (non-condensing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e Dimensions\u003c\/th\u003e\n\u003ctd\u003e 31.5 × 29.5 × 85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e Additional probe cable length\u003c\/th\u003e\n\u003ctd\u003e 1.5m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e Adjustable probe height\u003c\/th\u003e\n\u003ctd\u003e approximately 0–7.7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e Supported systems\u003c\/th\u003e\n\u003ctd\u003e iOS 13.0 or later, Android 8.0 or later\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\u003cbr\u003e Warranty: months\u003cbr\u003e\u003cbr\u003e The text is machine translated.\u003cbr\u003e\u003cbr\u003e\u003ch2\u003eIt is important to know\u003c\/h2\u003e\u003cp\u003e The key to choosing one is that it matches your specific goal: detecting water leaks. Wi-Fi and hub-less operation make it easy to get started, but they don't in themselves guarantee compatibility with every smart home platform.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e If you want to connect it to existing devices or automations, check support for your ecosystem before purchasing; a Wi-Fi connection doesn't guarantee that devices will connect to each other.\u003c\/li\u003e\n\u003cli\u003e For a larger system, it makes sense to think in advance about how the sensor will fit into the broader design, rather than assuming compatibility based solely on the connection method.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e \u003cem\u003eSource of editorial recommendations: ENAA guides and team experience.\u003c\/em\u003e\u003c\/p\u003e\u003ch2\u003e In practice\u003c\/h2\u003e\u003ch3\u003e 💧 Water leak detection in the kitchen or bathroom\u003c\/h3\u003e\u003cp\u003e 🟢 Very suitable - it is a dedicated water leak sensor, so it makes sense to monitor rooms where you are concerned about leaks.\u003c\/p\u003e\u003ch3\u003e 🏠 The first step to a smart home\u003c\/h3\u003e\u003cp\u003e 🟢 Very convenient - it does not require a central unit to use, so you can start with one sensor without first setting up a system with a central unit.\u003c\/p\u003e\u003ch2\u003e Answers to frequently asked questions\u003c\/h2\u003e\u003ch3\u003e Do I need a control panel to use it?\u003c\/h3\u003e\u003cp\u003e No, this sensor does not require a control panel.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e\u003cbr \/\u003e\n{\u003cbr \/\u003e\n  \"@context\": \"https:\/\/schema.org\",\u003cbr \/\u003e\n  \"@type\": \"FAQPage\",\u003cbr \/\u003e\n  \"mainEntity\": [\u003cbr \/\u003e\n    {\u003cbr \/\u003e\n      \"@type\": \"Question\",\u003cbr \/\u003e\n      \"name\": \"Ali za uporabo potrebujem centralo?\",\u003cbr \/\u003e\n      \"acceptedAnswer\": {\u003cbr \/\u003e\n        \"@type\": \"Answer\",\u003cbr \/\u003e\n        \"text\": \"Ne, za ta senzor centrala ni potrebna.\"\u003cbr \/\u003e\n      }\u003cbr \/\u003e\n    }\u003cbr \/\u003e\n  ]\u003cbr \/\u003e\n}\u003cbr \/\u003e\n\u003c\/script\u003e\u003cp style=\"font-size: 0.9em; color: #666;\"\u003eDescription updated: November 2026\u003c\/p\u003e\u003ch2\u003e Read also\u003c\/h2\u003e\u003cp\u003e If you are still deciding, the following content may also be helpful.\u003c\/p\u003e\u003cp\u003e \u003cstrong\u003eBest products\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e \u003ca href=\"https:\/\/www.enaa.com\/najboljsi\/najboljsi-pametni-senzorji-in-detektorji\"\u003eBest Smart Sensors and Detectors 2026\u003c\/a\u003e\u003c\/p\u003e\u003ch2\u003e Why buy from ENAA?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e There are over 100 shopping guides available to help you make an informed choice.\u003c\/li\u003e\n\u003cli\u003e The descriptions are prepared neutrally, with clear information, and leave the decision to the buyer.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Meross","offers":[{"title":"Default Title","offer_id":59243962302795,"sku":null,"price":24.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0756\/3457\/3643\/files\/smart_multi_function_water_leak_sensor_meross_ms420_20266098.webp?v=1794492193","url":"https:\/\/enaa.eu\/products\/smart-multifunctional-water-leak-sensor-meross-ms420","provider":"Enaa","version":"1.0","type":"link"}