Digital Breath Alcohol Tester Breathalyzer Overview
Features:
Advanced semiconductor oxide alcohol sensor
This machine is reusable as many time as you want
Comes with 6 mouth pieces (mouth pieces can be washed and sanitizer for reuse)
LCD back light display
Digital Alcohol Breath Tester Breathalyzer Analyzer
Quick Response Professional LCD Alcohol Tester Digital Alcohol Detector
Police Alcotester Backlight Display
Auto power off.
Small size with key chain, light weight, easy to carry.
Digital alcohol tester with audible alert.
LCD backlit display for easy reading.
Quick response and resume.
Specifications:
Model AT-68S
Display Type: LCD
Type: Handheld
Sensor: Advanced semiconductor oxide alcohol sensor
Detect range: 0.00%-0.19% BAC (0.0-1.9g/l)
Accuracy: +/-0.01 ~ +0.02% BAC at 0.05%BAC
Warm up time: Within 10 seconds
Response time: Within 5 seconds
Operating temperature: 10 C ~ 40 C
Environmental temperature: 40% ~ 90%
Power source: 2 * AAA batteries (Not included)
Color: Black
Size: 120 x 45 x 28.8mm
Package include:
1 x Breath alcohol tester including Retail Packaging
5 x Mouthpieces (1 Attached to machine and 4x Extra)
User Manual

Medium Format
Medium format refers to the size of your roll of film (or if you’re talking digital, it’s the size of the camera sensor). It really just means that you are shooting on a bigger piece of film than you do with a 35mm camera. The increased size of medium format film means a much larger negative. This will give you finer details and less grain.
Choosing your Right Medium Format Camera
Twin Lens Reflex (TLRS)
TLRs use two objective lens of the same focal length. The photographic objective lens is the one that is used to take the picture. The other lens, called the view lens, is connected to the viewfinder. Most TLRs are fixed focal length, and the more expensive models may incorporate a rudimentary room function. Most TLRs use a leaf shutter system, resulting in high speeds, quiet operation and low shutter vibration. There are also close-up, wide angle and telephoto adapters for TLRs.
Some popular TLRS cameras are: Yashica MAT-124G, Rolleiflex 2.8F, Minolta Autocord and Mamiya C330


Rangefinder
Rangefinder cameras are medium format cameras with a range finder. This negates the waistline, viewing that most TLRs carry. They are also much smaller than TLRs, and allow for easier point and shoot photographs. They tend to have limited focusing ranges, and do not have lenses larger than 180mm or 200mm. Rangefinders are quieter and easier to focus in dim light. They are mostly fixed lens models, but higher range models also provide for interchangeability.
Some popular rangefinder cameras are: Fujica G690, Mamiya 6/7, Bronica RF645, Norita 66 and Pentax 67
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