Hey there, if your Apera PH60 pocket pH tester’s probe is acting up or just old, this PH60-E replacement probe is exactly what you need to get it working like new again. It’s the official spare part, so you know it’ll fit and perform perfectly. It features a super sensitive glass bulb membrane and has a built-in temperature sensor for accurate readings. The measuring range is awesome: from -2.00 all the way up to 16.00 pH, and it reads temps from 0°C to 50°C. It uses a gel KCl electrolyte, which means it’s basically maintenance-free – no refilling liquids! Just give it a quick calibration now and then. It’s designed for general water solutions, so it’s perfect for your hydroponics setup, aquarium, pool and spa monitoring, water treatment checks, or environmental sampling. The probe diameter is 2.5 cm. With proper care (keep the bulb moist and clean!), it should give you reliable service for 12 to 24 months. A must-have spare for any serious water tester.