Tds Meter - Range: 0-1990 Ppm, Resolution: 10 Ppm, Dimensions: 150x30x24 Mm | Accuracy: +/- 2%, Battery Life: 350 Hours, Temperature Compensation: 5-50â°c, Portable Design

Pocket Microscope - 30x Magnification , Built-in Illumination and Focusing Wheel for Detail Observation

Countdown Timer - Premium Plastic, Maximum 99 Min 59 Sec | Foldable Stand, Magnetic Back, Battery Operated

Digital Potentiometer - 0 to 1999mV Range, 3.5 Digit LED Display, High Input Impedance | Ideal for Chemistry Labs and Pharmaceutical Industries

Stage Micrometer - Precision Ground Glass Slide 25mm x 75mm | Brightly Illuminated Grid Lines, 1mm Total Length Subdivided into 100 Divisions of 0.01mm Each

Nebulizer - 17cm x 14.5cm x 11.2cm, Lightweight Compact Design with Quiet Piston Compressor

Garmin E Trex H GPS Receiver - 4.4" x 2.0" x 1.2" Dimensions, Waterproof IPX7 Rating, 17 Hour Battery Life, High-Sensitivity Receiver, Tracks 10,000 Points

Portable Ultrasonic Flow Meter - 100 H x 66 W x 20 D mm, Accuracy +/- 1% of Reading, 3 x AAA Battery Power

Tuning Fork - High-Quality Alloy | Precision Frequency Tuning from 256 to 512 Hz

Directional Compass

Altimeter-Barometer-Weather Forecast Device - 0 to 5000m Altitude Range, 550 to 1000hPa Pressure Range | Versatile Dual-Dial Functionality, Accurate Atmospheric Measurement