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Juchuang The B-type portable chemical oxygen demand rapid tester is an integrated intelligent instrument designed by our company for monitoring and supervisory personnel to measure the chemical oxygen demand of various water samples on site. Juchuang portable instrument has the characteristics of automatic temperature control, dual LCD display, AC and DC dual-use, automatic zero adjustment, direct reading of concentration, curve storage, automatic printing, etc. The instrument is easy to operate and operates interactively, so users do not need complicated professional knowledge. knowledge to apply this product.