New, old stock Melles Griot Helium Neon laser system.

Specifications:
MFG/ model:
Melles Griot 25-LHP-073-249
Output Power: 
2 mW minimum 2.5 mW typical
Wavelength: 632.8 nm RED
Polarization:
 Linear, 500:1
Mode: TEMoo
Beam Diameter: 0.76 mm
Beam Divergence: 1.06 mRads.
Input Voltage: 115 / 230 VAC, 50-60 Hz.
Dimensions: Head: 280 mm long 35.1 mm dia.
Power Supply: 133 mm long 128 mm wide 61 mm tall
Warranty: Limited 1 year from date of purchase.
CDRH Class: 3a