Compact and portable, this affordable pH meter can accurately measure the pH values of a variety of liquids. It is easy to use, water-resistant, and perfect for many different applications including food and beverage production control as well as brewing and fermentation. Many sushi chefs use this pH meter to comply with food safety regulations concerning holding rice. Calibrates at two points (pH 4.0 and 7.0).

Specifications

• Model: DPH-2
• Dimensions: 1 5/8" x 2" x 6 1/4"
• Weight: 3.17 oz
• Measurement range: 0.0 to 14.0 pH
• Resolution: 0.1 pH
• Measurement accuracy: ± 0.1 pH (2.0 to 12.0 pH)
• Operates on 4 x LR44 batteries

Click the below image to view
It shows "Prepare acidification agent per recipe with target pH of 4.1 or less, but not to exceed 4.6". Sushi restaurants in NY state are required to have a pH meter for this purpose.