Molectron Opti-Mum 4001, 4-Channel Joulemeter / RatiometerCondition: * Not Working, For Parts.* Powers Up, Back Light Not Working. Unable To Test Further. As Pictured.Additional Notes:* 4 Independent Channels* Measure pulse energy or peak voltage independently of each channel* Rep rates up to 1000pps* Wide Dynamic Range: pJ to J, V to V* Ratio measurement: any two channels, any order* Autorange and baseline correction* Manual or Remote Configuration* RS-232 and IEEE-488 Interfaces* Data Logger and Trigger Syncer* Touchscreen DisplayMolectronOpti-Mum 4001