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Jar tester Labotronics Jar tester is a flocculation testing unit with four stirrers to stirr Up to 2000 mL .Durable brushless DC motor with digital speed indication & built-in timer. The fixed illuminator provides glare-free lighting to test the conditions (stirring speed, flocculant dosage, settling time) that affect the separation suspended particles or impurities. The settled flocs are visually inspected, and their properties are recorded