30 Pieces TENS Unit Replacement Pads, Multiple Sizes TENS Unit Pads with Pad Holder, Reusable and Self-Adhesive Electrodes Pads Compatible with AUVON TENS 7000 EMS Machine (Latex-Free, NonIrritating) 1 update_march2023 This test can only be

This test can only be used to detect red-green color blindness

Durable cast zinc body

No need to use harmful substances

Frequency response: 10Hz to 50kHz +/-1dB

such as compression packing seals

30 Pieces TENS Unit Replacement Pads, Multiple Sizes TENS Unit Pads with Pad Holder, Reusable and Self-Adhesive Electrodes Pads Compatible with AUVON TENS 7000 EMS Machine (Latex-Free, NonIrritating) 1 update_march2023 This test can only be30 Pieces TENS Unit Replacement Pads, Multiple Sizes TENS Unit Pads with Pad Holder, Reusable and Self Adhesive Electrodes Pads Compatible with AUVON TENS 7000 EMS Machine (Latex Free, NonIrritating) Product Features [Different Set] Our package includes 20 pieces of 2 x 2 inch, 8 pieces of 2 x 4 inch pads and 2 pieces of 4 x 4 inch pads, Unlike other sets, we added a pair of 4'' x 4" extra large tens pads for a large muscle group massage, So I think