HW-30A/50A: With external circulation, temperature control range 5~65°C, temperature control accuracy: 0.1°C, input power AC220V.
HW-30B/50B: Without circulation, temperature control range 5~100°C,temperature control accuracy: 0.1°C, input power AC220V.
30A/B: 30L 50A/B:50L
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