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Field Calibration

Lume 1.2 – CBT Calibration

Paired calibration of the Lume 1.2 sensor against the Aquagenx Compartment Bag Test (CBT) — an MPN-based reference method widely used in international water quality monitoring. Each data point is a paired grab sample from Kigali field deployments, matched to the nearest sensor reading within ±20 minutes.

Observed vs. Predicted E. coli — CBT

Each point is a paired grab sample where the reference assay was a compartment bag test (CBT) — observed CBT result (x-axis) vs. the sensor model prediction at the nearest reading within ±20 min of sample collection (y-axis). The dashed line is the 1:1 reference. Pairs accumulate as Kigali field deployments scale.

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About the CBT method. The Aquagenx Compartment Bag Test is a portable, field-ready MPN assay approved for use in lower-resource settings. It does not require incubators or lab infrastructure, making it the standard reference for international water safety monitoring programs. The Lume sensor model used here was trained on Colilert (IDEXX) data; CBT validation is an independent out-of-sample test of cross-method generalization.