Vee Gee Scientific BTX-20 Handheld Refractometer, with Brix Scale, 0-20%, -0.1% Accuracy, 0.10% Resolution, 10 to 30 degree C ATC

Vee Gee Scientific BTX-20 Handheld Refractometer, with Brix Scale, 0-20%, +/-0.1% Accuracy, 0.10% Resolution, 10 to 30 degree C ATC

Apera Instruments Premium-Series PH60S Food pH Pocket Tester Kit, Swiss Spear pH Electrode, ±0.01 pH Accuracy, -2.00-16.00 pH Range (AI313)

Apera Instruments, LLC-AI1201 Apera Instruments,LLC PH60-E Replacement Probe for PH60 Pocket pH Tester