WHICH ELECTROSTATIC NOZZLE SIZE IS SUITABLE FOR SPRAYING COMPUTERS, PHONES AND OTHER ELECTRICAL DEVICES?

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You want to ensure that the electrostatic nozzle is tested for uniformity of particle size which means that you will not have larger particles in the central cone of the stream. This reduces disinfectant accumulation on surfaces that could seep into the gaps between the keys on your keyboard or drip down your computer screen.
This uniformity in particle size makes it safe for spraying disinfectants on your office electronics.  We do recommend opting for a 45-micron nozzle when spraying around electronics to keep to a minimum particle size. BUT this has to be tied into what the dwell time is for your disinfectant.  A 45 micron nozzle delivers a 4 minute dwell time for drying.  So ensure the disinfectant you are using does not need a dwell time longer than 4 minutes if you are using the 45 micron nozzle. If it does then you need a larger nozzle size.
and of course…Do not, spray anything into sockets and electrical ports!
Rowe services sells Bioesque plant based disinfectant that uses THYMOX which is on both the EPA N and Health Canada Lists and only needs a 4 minute dwell time. Rowe also sells electrostatic sprayers to help with application of the product.