PH-2011 0.8" 4-Digit LCD High Precision PH Meter Test Pen w/ Back Light - Red + Silver (4 x AG13)

Pros: + Cheep price + Good quality + English instructions + Back lit clear display

Cons: - The box was open upon receiving the product. (might have been the toll's fault. Nothing else so far.

Other: For this price, its a great product. Have a cheaper one (yellow one, that I ordered from ebay) that is a lot lower quality, this one is fairly sturdy and I'm glad for my impulse purchase.

Pros: This type pH meter is known by me, during laboratory research I have used these meters for years. They are as reliable as table-instruments but are much smaller and more easy to handle. The two ponits calibration make that the zeropoint ((pH 7.00) is better than a pH 7.00 puffer and an alcaic-or acid puffer . The puffersalts are delivered too, making pure puffers ask skilled and proper work

Cons: As all pH meters, the electrodes are very sensitive for dirt and mechanical impact. The measutement is as precise as the quality of work and calibration. That makes the pH meters a little difficult to handle Storage must be done at the proper way, the meter will be damaged when not the utmoste care is taken during work and storage.

Other: The lab-grade precision and the price are only reached with proper handling and they are VERY sensitive for wrong handling or careless storage. The user needs knowledgment about chemistry and proper handling. These pH meters are not suitable to use them as a toy, they are really capable to satisfy the professionals.