We recently made a relatively simple, valuable change to the wiper arms on our C3, C6P, & PhytoFind Submersibles. We had received photos from a customer that showed such severe growth on the old plastic arms that there was a possibility the growth could block the optics. Changing to copper arms should significantly discourage growth on the arms. There is no price change for this improvement. All instruments shipping now include the copper arms. We are offering upgrade kits for older instruments. (PN 2300-459 for the C3 & 2360-459 for the C6P & PhytoFind) Please contact sales if you are interested in purchasing.