pH meter measures how acidic or alkaline a solution is. It actually measures the concentration of Hydrogen Ions in water and electronically converts into a scale from 0 to 14 and displays on a Liquid Crystal Display
pH tester is used to obtain a quick measurement of the acidity or alkalinity of a solution. It can be a pocket electronic device or simply a strip of paper that changes colour with acidity or alkalinity.
Thermocouple is a widely used temperature sensor constructed by welding the tips of two dissimilar metal wires together. It produces a temperature dependent voltage that can be converted electronically to a temperature value to be displaced on an LCD.
Light Meter measures the intensity of light in lux or foot-candle. Often used in building environmental monitoring, photography and visibility in sporting events.
Humidity Meter usually measures how saturated the air is with water vapour. A very useful parameter for environmental control, especially in medicine storage, and weather forecasting.
Lux Meter measures the intensity of light necessary for the development of plans. Suitable for plants and aquariums. Water proof option is available