ADC BioScientific Air Plant Soil Test LED Light photosynthesis PLU5 ?? PN#- PLC-N-10644 I do not know if this was the generation before the PLU5, or even exactly what this does. But it looks very similar to the PLU5 that ADC makes today. This was from a company that was acquired by ADC. So this is an older model unit. Pre-1969 But I got this from a GOVT. Surplus auction. Everything I have acquired from the agency is in working order. So this will work or your money back. Have not tested it. The cords have been cut. Will take some care and knowledge to get this thing working perfect again. This is why I am selling this so cheap. You know what a PLU5 cost and it is big bucks. This is 12 V DC current. Get yours today. FREE SHIP in USA. ADC BioScientific Air Plant Soil Test LED Light photosynthesis PLU5 ?? PN#- PLC-N-10644 I do not know if this was the generation before the PLU5, or even exactly what this does. But it looks very similar to the PLU5 that ADC makes today. This was from a company that was acquired by ADC. So this is an older model unit. Pre-1969 But I got this from a GOVT. Surplus auction. Everything I have acquired from the agency is in working order. So this will work or your money back. Have not tested it. The cords have been cut. Will take some care and knowledge to get this thing working perfect again. This is why I am selling this so cheap. You know what a PLU5 cost and it is big bucks. This is 12 V DC current. Get yours today. FREE SHIP in USA.