The ALERT™ J4X portable evidential breath alcohol tester is trusted by law enforcement professionals worldwide. At its heart is our highest quality Electrochemical Sensor (Fuel Cell). It uses one button to control power, testing, history recall and calibration.

The ALERT™ J4X complies with the normative EN 15964.


Size: 150 mm x 88 mm x 35 mm
Weight: 300 grams
Sensor: Electrochemical (fuel cell)
Specificity: Alcohol only, no response to ketones or hydrocarbon
Ambient Temperature: -20°C to +50°C
Purge Cycle (Initial Test): 5 seconds
Breath Sample: 5 second moderate and continuous breath sample
Analysis Time: < 25 seconds
Recycle (Recovery) Time: 5 seconds
BrAC Readout Format: mg/dL, g/dL, g/L, mg/L, µg/dL, µg/L
Range of Measurement: 0.00 to 0.50 g/dL
Accuracy: ± 5% at 0.10 g/dL
Display: Three digit LCD
Last test recall: Yes
Power / Battery: 2 AA alkaline
Number of Tests: > 1,000 tests
Mouthpiece: Round (model: 95-000250)
Calibration: Alcohol/Water Simulator
Optional: 2 & 3 year Product Protection Plan