Check the listing for details. HeNe Laser Heads - Several Types - Teaching, Research, Modes, Stabilized, Zeeman. Condition: For parts or not working. Listed at 75.00 USD. This listing is for GUARANTEED TESTED WORKING and to run at normal current (unless specifically noted otherwise) HeNe laser heads of various types. All are "hard-sealed" which means that despite their actual age, they do not decay on the shelf or need periodic petting (running) to keep them healthy.Photos are of the actual laser. However, if retesting finds an issue not listed, I may opt to send a different laser head with at least the same output power and overall performance, and cosmetic condition. If no photo is present, ask. Red Coherent 31-2066-000 (same as Melles Griot 05-LHP-171) >8 mW Linearly Polarized: Spec is 7 mW. Melles head with Coherent label. ;-) Red Hughes 3227H-C >7.25 mW Random Polarized: Spec is 7 mW.Red JDSU 1135P >6.4 mW Linearly Polarized: Spec is 5 mW.Red JDSU 1137P >7.4 mW Linearly Polarized: Spec is 7 mW.Red Melles Griot 05-LHP-212 >1.0 mW Linearly Polarized: Spec is 1 mW. Slow start in dark - not recommended for installation in an instrument. Red Melles Griot 05-LHP-111 >2.25 mW Linearly Polarized: Spec is 1 mW.Red Melles (Hughes) 2.25 mW Linearly Polarized: Spec is 2 mW.Red Melles Griot 05-LHR-201 >3.5 mW Random Polarized Low power: Spec is 5 mW. No end-caps or cable. Red Melles Griot 05-LHR-151 >6.5 mW Random Polarized: Spec is 5 mW.Red Melles Griot 05-LHP-991 >11 mW Linearly Polarized: Spec is 10 mW. Slow start but runs fine. Red Melles Griot 05-LHR-991 >12 mW Random Polarized: Spec is 10 mW.Red Melles Griot (Hughes) 3230H-PC >12 mW Linearly Polarized: Spec is 10 mW.Red Melles Griot 05-LHR-991 >13 mW Random Polarized: Spec is 10 mW.Green Melles Griot 05-LGP-151 >0.6 mW Random Polarized: Spec is 0.5 mW.Green Melles Griot 05-LGP-193 ~0.1 mW Linearly Polarized: Very weak, spec is 1 mW. Use the tube as a laser lamp or high tech sculpture and repurpose the head cylinder. Green Melles Griot 05-LGP-193 1.0 mW Linearly Polarized: Spec is 1.0 mW. Green PMS LHGR-0050 >0.8 mW Random Polarized: Spec is 0.5 mW.Infra-Red 1,523 nm 14" REO LHIP-0010 ~1.0 mW: Research Electro-Optics INFRA-RED 1,532 nm HeNe laser tube installed in Melles Griot head cylinder, tested. The white Nylon thumb screws allow for precise alignment, but I would remove them and install fixed permanent mounting screws upon request. This would make an excellent wavelength reference for a wavemeter but a really boring laser pointer. :) THE POWER SUPPLY IS NOT INCLUDED but suitable brick and lab supplies may be available. If purchasing, please DO NOT pay until I have confirmed that the head(s) test as described. I will then send an invoice. International shipping via the eBay Global Shipping Program. RETURNS: Unless otherwise noted, all of these laser heads are tested and guaranteed to be as described. Returns will be accepted should this be found not to be the case except as noted. Warranty is void if found to have been run on an incompatible power supply or with reverse polarity and ruined (which can be determined from a forensic analysis), or used to pound nails, run over by a fork lift or dropped down a flight of stairs. Returning a pile of broken glass and metal bits is bad form. They will be packed to withstand anything the shipping company can dish out. Thanks for looking, --- sam