Herpstat intro +
Pros:
- $109
- Dimming Style Proportional
- Multiple layers of safety features including a safety relay that will cut power to the unit if it fails (prevents the thermostat from getting stuck in the "on" position)
- Soft startup (slowly ramps the heat to the set temperature to prevent rapid temperature changes)
- Built in night drop with temperature ramping
- Hi/Low temperature tracking with alarms
- Internal resolution of 0.1125 degrees F
- Accurate to 0.9 degrees F
- All settings are stored even after a power loss
- Can be mounted into an incubator for a clean look.
- Easy to navigate menu system
Cons:
- Small screen
- 2pin Edison plugs
VE-200D
Pros:
- Larger screen
- hi/lo temperature tracking
- all settings stored even after power loss
- 3 pin (grounded) Edison plugs
Cons:
- $114.99
- Night drop requires a separate unit
- fewer safety features
- poor menu system
Conclusion:
Both are good units but the herpstat delivers a lot more for less money