Optomech Engineers Pvt. Ltd. Offers Ground Truth Radiometer with Optical Projector Screen. Optomech Engineers Pvt. Ltd. Manufactures Precision Optical and Optoelectronic Measuring Instruments, several optical based accessories for CNC and conventional machine tools. The Ground Truth Radiometer with Optical Projector Screen has Radimetric Units Watts per cm sq per str per micron. The Ground Truth Radiometer with Optical Projector Screen comes with Better than 3% of Solar Reflectance. The Ground Truth Radiometer with Optical Projector Screen Optical Head of 12 V at 4 mA under dark conditions.