The 1st Light detects a Normal EMF field, what is always around us.The range is between 0 to 1.5 mG. The 2nd Light (GREEN) detects a Low Level EMF,which range is between 1.5 to 2.5 mG. The 3rd Light (YELLOW) detects a Mid Level EMF in the range between 2.5 to 10 mG.
eBay
1/5PCS Magnetic Reed Switch RC-33 NC Recessed Wired Window Door Contact Sensor Detector for Home Security Burglar Alarm Systems
Aliexpress UK
Detector 1. Compact product, easy to carry and storage. High-definition VA anti-display color screen: ultra-clear digital and analog dual display, at a glance. Sound & Vision. Storage temperature and humidity: -10~60℃/0~80%RH.
eBay
1-10PCS MC-38 Wired Door Window Sensor Magnetic Switch Home Alarm System Detector Reed Switch
Aliexpress UK
The 1st Light detects a Normal EMF field, what is always around us.The range is between 0 to 1.5 mG. The 2nd Light (GREEN) detects a Low Level EMF,which range is between 1.5 to 2.5 mG. The 3rd Light (YELLOW) detects a Mid Level EMF in the range between 2.5 to 10 mG.
eBay
MC-38 Wired Door Window Sensor Detector Magnetic Switch Normally Closed or Normally Open NC/NO for Home Security Alarm System
Aliexpress UK
Easy To Use and Operate: Electromagnetic radiation detector is mainly used for electrical appliances in life, which can effectively help people away from radiation sources and protect them from radiation hazards!
eBay
2pcs-Wireless Door Window Magnetic Sensor Alarm Detectors Home Security Alarm System
Aliexpress UK
The 1st Light detects a Normal EMF field, what is always around us.The range is between 0 to 1.5 mG. The 2nd Light (GREEN) detects a Low Level EMF,which range is between 1.5 to 2.5 mG. The 3rd Light (YELLOW) detects a Mid Level EMF in the range between 2.5 to 10 mG.
eBay
Ewelink Zigbee Door Sensor Wireless Magnetic Window Open Closed Alarm Detector Works With Zigbee2MQTT Alexa Google Need Gateway
Aliexpress UK
It is used to test and learn electromagnetic radiation situation indoor and outdoor. 1 Electromagnetic Radiation Detector. Alarm Threshold: 40mG, 0.4μT. Unit: mG / μT (Magnetic Field). Resolution: 1mG, 0.1μT.
eBay
5pairs MC-38 Wired Door Window Sensor Magnetic Switch Home Alarm System Detector Reed Switch
Aliexpress UK
[Battery Operated] This EMF reader is operated by 1 9V battery (not included), high efficient and save power. The small size is convenient to use and easy to hold. 1×Electromagnetic Radiation Detector.
eBay
Tuya ZigBee Door Window Sensor Smart Home Burglar Magnetic Alarm Security System Open Closed Detector Voice Control Alexa Google
Aliexpress UK
Item Type: Digital Magnetic Field Detector. Display backlight, 5 minutes automatic shutdown function. Support a variety of hall probes to be replaced, easy to use. Range: 200mT (2000Gs); 2500mT (25000Gs).
eBay
MC-38A Wired Door Window Sensor Detector Magnetic Switch Normally Closed or Normally Open NC/NO for Home Security Alarm System
Aliexpress UK