ANENG BT189 Universal Digital Battery Capacity Tester with LCD display. An essential diagnostic tool for testing various battery types (including AA, AAA, C, D, 9V, 16340 Lithium, and button cells within 1.2V–4.8V range). Features clear digital voltage readings to easily check power levels. A must-have tool for home use, labs, or electronics workbenches.

Universal Digital Battery Capacity Tester with LCD display from ANENG (Model BT138). Compact and highly portable, it requires no internal power supply to operate. An essential diagnostic tool for quick and accurate voltage readings across various battery types (including AA, AAA, 9V, 18650 Lithium, and button cells). A must-have gadget for any electronics workbench, lab, or home setup.

Universal Digital Battery Capacity Tester with LCD display from ANENG (Model BT169). An essential and quick-use diagnostic tool for checking the voltage and health of multiple battery types (including AA, AAA, 9V, 18650 Lithium, and button cells with a range of 1.2V–4.8V). Provides accurate digital readings to ensure your batteries are ready for action. A must-have gadget for any electronics workbench, lab, or smart home setup.

The Handheld Ozone (O₃) Analyzer & Air Quality Detector is a professional portable instrument designed for accurate real-time measurement of ozone (O₃) concentration and air quality assessment. It features a bright color display for instant data visualization and highly sensitive sensors for reliable environmental monitoring. Ideal for environmental engineers, occupational health and safety professionals, laboratories, industrial facilities, and academic research, this device provides precise air quality measurements to support environmental compliance and workplace safety.