This Pack includes Etching Tank, Heater and Air Pump!                                                    These Kinsten etching tanks are great for etching single and double sided Positive Acting Presensitized PCBs. The thin, vertical standing, design uses minimal etchant and have graduations for easy measurement.The Kinsten ET20 tank can etch a maximum PCB size of 20×30cm with heater. Etch tanks include three clips to suspend the PCB in the liquid etchant. This set include an air pump to bubble agitate the etchant, and heater to maintain optimal etchant temperature, for more efficient etching