The  hydrometer jar bath utilises a microprocessor-based temperature control with an integrated heater and chiller to maintain an ambient temperature of 68°F (20°C) throughout the whole apparatus. The H-4239A's control processor maintains a constant bath temperature of 68°F (20°C) that is accurate to within 0.1% of the input span 1°F, making it the perfect bath for keeping hydrometer jars in compliance with the aforementioned requirements. Numerous different procedures may be carried out in a lab using the hydrometer bath, which can be configured to maintain