Precision Crystal Heater board    
This heater is useful to bring the temperature of a crystal to 50°C.
* Temperature 50 °C ±1.5 °C
* The temperature stability is  0.01%
* Power supply 10 to 12V
* Max current consumption 90 mA (at start-up)
* Warm-up time max 1min.
* PCB size 10 mm x 13mm
* Suitable for HC49,HC49/U HC43, HC18, HC25 and HC42 crystals
* Smaller crystals are possible solder on PCB back side
The package contents:
1pc Crystal heater PCB board
1pc Heat shrink tube