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QIWEI ZYL portable residual chlorine instrument Measurement range 0-5mg/L, Power supply Voltage DC 1.5V × 5 AA alkaline dry batteries, AC 220V/50Hz/DC7.5V/0.2A power adapter, automatic shutdown, AC and DC dual use., resolution 0.01mg/L, Repeatability 1%, Linearity +/- (5% FS + 1 word).