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The TD-20/20 Luminometer detects down to 0.1 fg of luciferase and has a dynamic range of 107 or better using a range-extending filter. The TD-20/20 calculates sample average and variance for up to 20 replicate samples. ASCII data output is transmitted through an RS-232 serial port to a printer or computer. Optional internal autoinjectors provide userprogrammable single or dual injection of reagents. The unique sample compartment accommodates culture dishes, test tubes, microfuge tubes,doi:10.1126/science.272.5267.1505 fatcat:qdzjobzzjrbezeec4gpee5e2na