Smallest size (10 mm diameter), great for test tube pH measurement
Lithium glass membrane with built-in temperature sensor
Works well for 12-24 months under proper use and care
The a per a instruments SX615 probe is the replacement probe for SX610 ph pen tester. This replacement probe is equipped with glass bulb membrane and built-in temperature sensor. It has a measurement range of -2.00 to 16.00 ph and 0 to 50Ëšc. Its 10 mm diameter probe allows measurement in most Test tubes, making it perfect for educational use and other common aqueous solution's ph measurement, such as hydroponics, aquaculture, pool & spas, water treatment, environmental monitoring, etc. A per a instruments has been focusing on water analysis sensors and meters over 25 years. Our products have been helping people over 25 countries have a more reliable and affordable testing experience. All of our products are CE certified.