Insta-Test 3040-G High Range Phosphate Test Strips, 25 per Bottle

Measures the phosphate levels from 0, 100, 200, 300, 500, 1000, 2500 ppb in just 15 seconds. Each bottle includes 25 test strips packaged in a waterproof PopTop bottle with a molded desiccant liner, which protects the strips from moisture and UV light. This product includes trilingual (English, Spanish, French) instructions.