We are HK. based company and our factory locates in China DG. We design and produce our own high precision alcohol tester, electronic measuring instruments, Waterproof MP3/4 & other innovative products.We have established our FiT brand name alcohol tester since 2003 and we have about 30 different models now.Professional alcohol tester FiT333/FiT303/FiT238/FiT239-C/239-LC/FiT233 and Breath alcohol ignition interlock devices BAIIDs (FiT228) employ the most accurate and reliable Fuel Cell sensor. BAIIDs is designed to prevent a driver from starting a car when his breath alcohol content (BRAC) at or above a preset alcohol level. These devices are currently being used in connection with sanctions for driving while intoxicated. FiT228 is designed to meet the official standard for EU countries & US market DUI, DWI Program.* FiT333-color: The world 1st 3.2: TFT color LCD Police law enforcement alcohol tester with build in printer & touch panel FiT158-FC/FiT178-FC Make use of our latest patented system, an affordable & compact size professional tester with accuracy tolerance +/- 0.005%BAC* FiT233-AMOLED World 1st AMOLED Color PDA Fuel Cell Tester. Make use of our latest patented system, the 1st compact size PDA tester with only 15mm thickness * FiT239-LC: low cost fuel cell breath alcohol tester for personal use.* FiT303-FC: The world 1st True color display coins operated alcohol tester which using patented replaceable Fuel cell sensor module, used in public area, restaurant, Pub & Bar...* FiT239-color: The world 1st True color display with touch panel Fuel Cell alcohol tester.* Alcohol tester watch AAT188-Plus, the world 1st patented alco watch gives you the digital reading of you breathe alcohol concentration.* AAT101 the world 1st true color alcohol tester with touch panel feature and printer interface. It complies US DOT and most other countries��accuracy standards.* AAT198 Already Passed the US DOT test.