200 Pack Humidity Indicator Cards 3-60% RH, 6 Spots, Yellow to Blue Color Change for PCB, Electronics, Packaging, Storage (3-60% RH, 6 Spots, 200pcs)

Reliable Humidity Monitoring with 6-Point Precision Protect your moisture-sensitive products and components with our professional Humidity Indicator Cards. Designed with six distinct humidity spots, these cards provide a clear, visual alert when environmental humidity exceeds predetermined levels. The instant yellow-to-blue color change offers an unmistakable warning, making them an essential tool for quality control in electronics manufacturing, pharmaceutical storage, food packaging, and military equipment preservation. KEY FEATURES Advanced 6-Spot TechnologySix precisely calibrated cobalt chloride spots: 10%, 20%, 30%, 40%, 50%, 60% RHGraduated monitoring across low to high humidity rangesClear numerical labeling for instant spot identificationConsistent chemical formulation for reliable performanceInstant Visual ReadoutBright yellow indicates dry, safe conditionsDistinct blue color signals humidity exposureReversible reaction allows multiple monitoring cyclesHigh-contrast colors for easy readingProfessional QualityStandard trading card size (38mm x 104mm)Durable paper substrate with chemical coatingConsistent performance across temperature rangesLong shelf life when stored properlyConvenient PackagingProtective plastic jar with secure lid200 cards per containerEasy dispensing and storageIdeal for high-volume usersTECHNICAL SPECIFICATIONSSpot Range: 10%, 20%, 30%, 40%, 50%, 60% RHColor Change: Yellow (Dry) ↔ Blue (Humid)Card Size: 38mm x 104mmMaterial: Coated Paper SubstrateQuantity: 200 cards per jarAccuracy: ±5% RH

• 6-POINT PRECISE MONITORING: Features 6 calibrated humidity spots (10%, 20%, 30%, 40%, 50%, 60% RH) for accurate humidity level tracking across a wide range.
• CLEAR COLOR CHANGE: Easy-to-read yellow-to-blue color transition provides instant visual warning when humidity exceeds safe levels.
• RELIABLE PERFORMANCE: Reversible cards return to yellow when humidity decreases, allowing for continuous monitoring and reuse under dry conditions.
• BULK PACKAGING: Comes in a convenient jar of 200 cards, ideal for industrial, manufacturing, or frequent use. Each card size: 38mm x 104mm.
• WIDE APPLICATIONS: Essential for moisture-sensitive PCB, electronics, pharmaceuticals, food packaging, and military equipment storage monitoring.