1. Measuring PH value of the solution2. Measuring the temperature of the solution3. LCD backlight hold4. Data hold 5. Temperature unit switch6. Power off memory 7. Solution temperature compensation8. Low battery indicationSpecification: Package Weight One Package Weight 0.10kgs / 0.23lb One Package Size 20cm * 5cm * 5cm / 7.87inch * 1.97inch * 1.97inch Qty per Carton 120 Carton Weight 13.00kgs / 28.66lb Carton Size 52cm * 42cm * 32cm / 20.47inch * 16.54inch * 12.6inch Loading Container 20GP: 381 cartons * 120 pcs = 45720 pcs 40HQ: 885 cartons * 120 pcs = 106200 pcs