3M Dynatel Dyna Coupler is a tool specifically designed for locating underground facilities. It allows coupling of RF trace tone to large diameter pipes, bundle cables and cables enclosed in accessible non metallic ducts. This coupler operates at a temperature range of 4 to 122 F ( 20 to 50 C).3M Dynatel Dyna Coupler can withstand short time immersion under water. This coupler is compatible with 2273, 2210, 2250M, 2250, 2273M, 2220M, 2550, 2573 model locators. RoHS 2011/65/EU Compliant.