Humboldt Water Bath Temperature Controller Instruction to Unlock Lock change Fahrenheit to Celsius 

This Guide will Provide you with a visual instruction for unlocking your controller to change the degrees, from Fahrenheit to Celsius, and locking it again.
WARNING! Changing any setting beyond Fahrenheit to Celsius, while unlocked, will result in an incorrect calibration of the Temperature Controller.
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You can download the Manual here: www.humboldtmf...
Humboldt Mfg. Co., located in the United States, is a long-standing, leading manufacturer and supplier of testing equipment used for evaluating construction and civil engineering materials.
For full details visit www.humboldtmfg.com