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32 SMT007 MAGAZINE I NOVEMBER 2026 T H E C L E A N T R U T H F ew cleanliness tests have enjoyed the popularity of ROSE. In almost any elec- tronics manufacturing facility, you'll likely find a tester quietly producing results. For many years, these numbers were treated as the ultimate measure of cleanliness. If the value was below a specified limit, the assembly was considered clean. If it exceeded the limit, corrective action followed. BY D R . A DA M K L E T T, KYZ E N ROSE Testing Has Its Limits The clean truth is that ROSE testing is neither as powerful nor as flawed as its strongest supporters and critics claim. Like any analytical tool, its value depends entirely on understanding what it actually measures and applying it appropriately. What Is ROSE Testing? ROSE stands for "resistivity of solvent extract." At