Apera Instruments AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy

• Easy auto. calibration with buffer recognition; auto. temp. compensation (ATC) ensures accuracy in various temperatures (32 to 122F)
• Backed by Apera quality pH sensor with low impedance, ensuring a high response rate
• Comes in a rugged carrying case with pH 4&7 buffers and a lanyard
• Auto-recognition of stable values improves consistency, so you don't have to guess when to manually hold the measurement
• Up to 2000 hours continuous operation, powered by AAA batteries