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Hand Held Portable fluid testing Refractometers Laboratoryindustry Refractometers with best price WZS Series, US $ 10 - 20 / Set, Zhejiang, China, OEM, WZS 5 WZS10WZS 18 WZS 20.Source from Hangzhou Boyn Instrument Co., Ltd. on Waimaotong.com.