Check the listing for details. OSTech Laser Diode & Temp Controller – T12783, Electro Optical Instrument -Works. Condition: Used, Made in United States. Listed at 995.00 USD. Working Ostech t12783 Laser diode and temperature controller. These units are from a company that recently closed down. All are in working condition and were in use until work stopped. There are no major physical or electrical flaws I could find. In the pictures there is a fault light on but this is because there is no load, or it is not connected to anything and the interlock was tripped. I have 5 total of these so you may not get exactly what is pictured. All units are extremely similar and I am happy to provide pictures of the exact unit before purchase. They may also have different or no cables plugged into the back of them. Please reach out with any questions you may have. Thank you for looking.