Compared to a semi-conductor type breathalyzer, a fuel cell type breathalyzer offers the following advantages:
Higher accuracy. A typical semi-conductor type breathalyzer like the AL6000 & AL7000 has an accuracy level of ±20% at 0.05% BAC but a fuel cell type like the Alcoscan ALC-1 has an accuracy level of ±5% at 0.05% BAC which makes it 4 times more accurate.
Less frequent recalibration required. For semi-conductor type breathalyzer, you will usually need to recalibrate the breathalyzer after around 100 to 300 usage but a fuel-cell type can usually last up to 1,000 usage before recalibration is required.
No false positive. A fuel cell type breathalyzer will only give a positive alcohol reading if ethyl alcohol or drinking alcohol is present in the blood where else reading from a semiconductor sensor type breathalyzer can be affected by other chemical substances or give a false positive reading if the user is diabetic or on a low calorie diet (dieters and diabetic users are known to produce a high level of acetone in their breath which the fuel cell sensor can distinguish which would otherwise be wrongly detected as alcohol with a semiconductor sensor)
Factors to consider when buying a fuel cell type breathalyzer:
Certificate of Approval by internationally recognized authorities. To make sure that the breathalyzer that you are purchasing is as accurate/reliable as what the manufacturer/seller claimed, check with them if their breathalyzer have been approved by authorities like CE, AS or FDA.
Number of usage before recalibration is required. All alcohol testers need to be recalibrated after a certain number of usage. Some require calibration after a few hundred uses while some can be used up to 1,000 times. Make sure to take this into account when buying a fuel cell breathalyzer so that you do not end up buying a lower priced breathalyzer which require more frequent recalibration (which leads to higher maintenance cost).
Ease of recalibration. Sending your alcohol tester to a lab for recalibration can be costly and troublesome. Consider getting a breathalyzer that you can recalibrate simply by changing its sensor module (eg ALC-1 Breathalyzer).
See below for our recommended Fuel Cell Sensor type breathalyzer: