Universal Series 39 Purple Pens (Pack of 6) - 0.60IN Replacement Pens for Circular Chart Recorders | Perfect for Industrial Data Recording & Equipment Maintenance

Bluelab PENSTP pH & Conductivity Meter Starter Kit - Digital Nutrient Tester for Hydroponics, Aquariums & Gardening | Waterproof Pens, Temp Sensor & Probe Care | Indoor/Outdoor Plant Monitoring

Professional VEVOR Sandblaster Kit - 2 Pens & 2 Tanks Dental Sandblasting Equipment with LED Light and Glass Window for Metal, Wood, Ceramic Surface Treatment | Perfect for Jewelry Making, Dental Labs & Industrial Cleaning