it is with sorrow I must sell my SSP-4 JH band infrared photometer. It is in excellent shape, has the larger more stable PIN diode and includes everything needed to start doing infrared photometry. It even includes the hardwood case and dehumitfier. Optec lists this sans case for $4195, but I'm asking only $2500. Al Stiwing will be bringing it to the SAS meeting to show anyone that is interested. If you are interested or haven't questions please email me at firstname.lastname@example.org.