Portable Digital PH Meter Pen Tester Overview
Feature:
1. The measuring range of this PH tester is 0.00~14.00 PH, 0.01 PH resolution, accuracy ±0.1PH, to meet your various needs.
2. The product is made of high quality plastic material, lightweight and durable, long lasting performance, and easy to carry.
3. This digital PH meter with automatic temperature compensation, has accurate test results and is very suitable for home or laboratory use.
4. This acidity meter measures quickly and efficiently. It is easy to operate, so you can use it with confidence.
5. It is widely used to test water, soil, swimming pools, aquariums, spas, hydroponics, food, beverages, and beer, etc.
Specification:
Item Type: PH Tester Material: Plastic Range: 0.00~14.00PH Resolution: 0.01PH Accuracy: ±0.1PH Battery: 4 x 1.5V button battery (Battery Not Included) Temperature Compensation: 0℃~50℃ Working Temperature: 0℃~50℃ Product Size: Approx. 151 x 33 x 20 mm / 5.9 x 1.3 x 0.8 in Application: Suitable for household drinks, swimming pools, soil, aquarium water Weight: Approx. 113g / 4oz
Color: Yellow
Operation:
Step 1. Remove the protective cap.
Step 2. First clean the electrode with distilled water, and suck it with filter-paper.
Step 3. Turn on PH by "ON-OFF"switch located on the top of battery case.
Step 4. Immerse the PH meter electrode in solution up to be the immersion level. Under no Step circumstances immerse above display level.
Step 5. Stir gently and wait for the reading to stabilize.
Step 6. After use, Switch off PH, Use the distilled water clean the electrode and replace the protective cap.
Package List:
1 x PH Tester (Battery Not Included)
1 x Screwdriver
1 x Manual
2 Pouches of calibration buffer solution (4.00 & 6.86)
Easy to Calibrate
You can simply follow the instruction on the provided packet of solution 4.01 or 6.86, immerse the PH tester in the solution and adjust with the provided screwdriver to dial it in.
Operation
Step 1. Remove the protective cap.
Step 2. First clean the electrode with distilled water, and suck it with filter-paper.
Step 3. Turn on PH by "ON-OFF"switch located on the top of battery case.
Step 4. Immerse the PH meter electrode in solution up to be the immersion level.Under no Step circumstances immerse above display level.
Step 5. Stir gently and wait for the reading to stabilize.
Step 6. After use, Switch off PH, Use the distilled water clean the electrode and replace the protective cap.
Package Contents
1)1 x pH meter
2)1 x screw driver
3)2 pouches of calibration buffer solution (4.01 & 6.86)
4)1 x instruction manual ( English)

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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