Lightning & visibility Download our 2026 edition Senseca Instruments brochure for featured products & applications in Singapore.Senseca lightning & visibility instrumentsLooking for top-quality measurement instruments?Contact OTM nowMessage us:Email us:info@otm.sgCall us:(+65) 6908 0126Lightning warning systemBTD-200 lightning warning system (35 km detection range, automatic alerts)Visibility sensorRWS-20 road visibility sensor (forward scatter, up to 7.5 km)