This promotional package includes a SP-510-SS upward-looking thermopile pyranometer sensor head with a 30 cm cable, a microCache Bluetooth micro-logger, an AA-090 protective neoprene case, an extra 2545 microCache battery, and an AM-020 Apogee PVC sensor platform. When paired, these two devices are a powerful tool for monitoring photosynthetically active radiation (PAR) with research-grade accuracy for optimal plant growth.