Need portability and extreme stability. Hart Micro-Baths have both. We invented the Micro-Bath. While many have tried to replicate it they can't use the proprietary Hart Scientific controllers, so none of them deliver performance like a Hart bath. Micro-Baths can be used anywhere for any type of sensor. It is smaller and lighter than most dry-wells, has a spill-proof lid, and easy to carry. Micro-Baths can even be transported with the fluid in them. Range: -5 degrees Celsius to 125 degrees Celsius (23 degrees Fahrenheit to 257 degrees Fahrenheit)