including an extra large

2 ORP at 25 degrees Celsius

With replaceable sensors

MA884 Digital Refractometer

pH electrode: MA906BR/1 amplified pH/temperature probe (supplied)

Milwaukee pH54 Waterproof pH Tester | Replaceable Probe Pen Meter | ±0.1 pH Accuracy SE600 probe including an extra largeDESCRIPTION The Milwaukee Waterproof pH54 Tester is one of our most accurate low cost, rugged and reliable pH testers in the market featuring the ability to easily replace the probe providing for years of carefree use. It's simple 2 point manual calibration is simple to use. Ideal for use in aquariums, hydroponics, horticulture, education and many other applications. The Milwaukee Waterproof pH54 pH tester offers: ACCURACY The Waterproof pH54 tester