APERA Instruments AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy & n Buffer Solution Kit (pH 4.00 & 7.00), Plus 4oz. 3M KCL Storage Solution for pH/ORP Electrodes

APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH AccuracySimply the most reliable pocket pH tester with the best value for general-purpose pH testing e.g. hydroponics, horticulture, pools and spas, water treatment, beverage making, education, environmental monitoring, etc. Up to 3 points of Auto. calibration and 0 to 50˚C Auto temperature compensation (ATC), 0. 1 pH Accuracy with 0 to 14. 0 pH measuring range; Auto. recognition and indication of stable values improves repeatability, saving you the trouble of guessing when to manually hold measurement. PH20 comes with a complete kit of premixed calibration solutions (4.00 and 7.00), 4 AAA batteries, and a lanyard all in a portable carrying case. Smart Self-diagnosis, warning of incorrect buffer solutions and incorrect calibrations. IP67 water-resistant. Up to 2000 hours' operation powered by AAA alkaline batteries. The product is CE and RoHS certified, and is manufactured under an ISO 9001: 2015 certified quality system.8oz. pH Calibration Buffer Solution Kit (pH 4.00 & 7.00), plus 4oz. 3M KCL Storage Solution for pH/ORP ElectrodesApera Instruments AI1108 pH Calibration Buffer Solution Kit (pH 4.00 & 7.00, 8oz. each), plus 4oz. 3M KCL Soaking Storage Solution for pH/ORP Electrodes. Apera pH calibration buffers are produced in an ISO 9001:2015 facility with ISO 17025:2017 accreditation using high-purity reagents, deionized water and certified analytical balances in a temperature controlled environment. Reported values are accurate to +/- 0.01 pH at 25°C and are traceable to NIST Standard Reference Materials (SRMs). MSDS documents are downloadable. Certificate of analysis can be achieved by request. All pH buffers have a 2-year expiration from manufacture for an unopened bottle.

• Product 1: Easy auto. calibration with buffer recognition; auto. temp. compensation (ATC) ensures accuracy in various temperatures (32 to 122F)
• Product 1: Backed by Apera quality pH sensor with low impedance, ensuring high response rate
• Product 1: Comes in a rugged carrying case with pH 4&7 buffers and a lanyard
• Product 1: Auto recognition of stable values improves consistency, so you don't have to guess when to manually hold measurement
• Product 2: Reported values are accurate to +/- 0.01 pH at 25 °C and are traceable to NIST Standard Reference Materials (SRMs).
• Product 2: Produced in an ISO 9001:2015 certified facility using high-purity reagents, deionized water and certified analytical balances in a temperature controlled environment.
• Product 2: color-coded for quick identification.
• Product 2: Double-sealed. 2-year expiration from manufacture for an unopened bottle.