This compact tester features a large easy-to-read LCD. Unlike other pH testers, the pH electrode can be interchanged w/any pH electrode of different size & shape. This allows you to use application specific electrodes & saves the cost of a new meter when it is finally necessary to replace an exhausted electrode. The tester is fast, accurate, lightweight. Testing pH has never been easier! Large screen display, the interface with screw extension composite electrode suitable for use in small diameter container measured directly. Readings can be maintained, convenient, fast & accurate. This instrument has a variety of colors to choose from, according to customer requirements supporting calibration fluid (liquid solution or powder) & a variety of packaging.