non invasive eeg brain wave sensor

{"cid":"91202554","title":"NUOYING NYKC3 Non Invasive Fixed Point Tuning Fork Externally Attached Ultrasonic Switch","imgUrl":"https:\/\/img.chinax.com\/nimg\/a0\/90\/3f8c60c0e6b60147644a584e011c-200x200-1.jpg","attrs":{"Price":"$99 to $159\/pcs","Brand Name":"NUOYING","Model Number":"NYKC3","Minimum Order Quantity":"1pcs","Delivery Time":"5-7 working day","Certification":"CE, SIL, ATEX","Place of Origin":"Xi'an,Shaanxi,China","Payment Terms":"T\/T","Supply Ability":"1000pcs per month","Packaging Details":"40*30*30cm","Grade":"Industrial","Warranty":"12 months","Customized support":"OEM, ODM","Applications":"Explosive gas environments other than coal mines","Probe material":"Magnet adsorption, gluing, tie hoops, etc","Power supply":"24VDC 220VAC","Process temperature":"-40 ~ +60\u2103","Signal output":"SPDT, dry contact","Measurable wall thickness":"6-50mm"}}